diff --git a/.gitignore b/.gitignore
index c626897..9b7e46f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/.gradle/
 /dist/
 /store/
 /nbproject/private/
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..585b925
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,14 @@
+language: java
+
+jdk:
+  - oraclejdk8
+
+cache:
+  directories:
+    - $HOME/.m2
+    - $HOME/.gradle
+
+sudo: false
+    
+before_install:
+ - chmod +x gradlew
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..b9f4d67
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2015-2016 Victor Melnik
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ae6b215
--- /dev/null
+++ b/README.md
@@ -0,0 +1,35 @@
+# OwnLang
+
+OwnLang - dynamic functional programming language. Available for PC, Android and Java ME devices.
+
+
+## Build
+
+Build using Gradle `./gradlew dist`
+
+or Ant `ant clean pack`
+
+or take a look to [latest release](https://github.com/aNNiMON/Own-Programming-Language-Tutorial/releases/latest) for binaries.
+
+
+## Run
+
+To run script use command
+
+`java -jar OwnLang.jar -f input.own`
+
+or 
+
+`java -jar OwnLang.jar < input.own`
+
+
+## Language specification
+
+[Wiki (Russian)](https://github.com/aNNiMON/Own-Programming-Language-Tutorial/wiki)
+
+[Examples](examples/)
+
+
+## License
+
+MIT - see [MIT licence information](LICENSE)
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..d8e6d40
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,40 @@
+apply plugin: "java"
+
+sourceCompatibility = '1.8'
+[compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
+project.ext.mainClass = 'com.annimon.ownlang.Main'
+
+sourceSets {
+    main.java.srcDir "src/"
+    test.java.srcDir "test/"
+}
+
+dependencies{
+    compile fileTree(dir: 'libs', include: '*.jar')
+}
+
+task run(dependsOn: classes, type: JavaExec) {
+    main = project.mainClass
+    classpath = sourceSets.main.runtimeClasspath
+    standardInput = System.in
+    ignoreExitValue = true
+}
+
+task dist(dependsOn: classes, type: Jar) {
+    from files(sourceSets.main.output.classesDir)
+    from {configurations.compile.collect {zipTree(it)}}
+    from files(sourceSets.main.resources)
+    libsDirName = "$rootProject.projectDir/dist"
+    
+    manifest {
+        attributes 'Main-Class': project.mainClass
+    }
+}
+
+repositories {
+    jcenter()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}
diff --git a/build.xml b/build.xml
index 6b5965a..50045cd 100644
--- a/build.xml
+++ b/build.xml
@@ -11,7 +11,7 @@
     <description>Builds, tests, and runs the project OwnLang.</description>
     <import file="nbproject/build-impl.xml"/>
     
-    <target name="package-for-store" depends="jar">
+    <target name="pack" depends="jar">
         <property name="store.jar.name" value="${application.title}"/>
         <property name="proguard.jar.path" value="store/proguard.jar" />
  
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..5ccda13
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..34639b2
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Thu Feb 25 22:28:48 EET 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.11-bin.zip
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..9d82f78
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..5f19212
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/nbproject/project.properties b/nbproject/project.properties
index c72e54c..75dc961 100644
--- a/nbproject/project.properties
+++ b/nbproject/project.properties
@@ -30,7 +30,7 @@ dist.javadoc.dir=${dist.dir}/javadoc
 endorsed.classpath=
 excludes=
 file.reference.json-20151123.jar=libs/json-20151123.jar
-file.reference.okhttp-3.1.2.jar=libs\\okhttp-3.1.2.jar
+file.reference.okhttp-3.1.2.jar=libs/okhttp-3.1.2.jar
 file.reference.okio-1.6.0.jar=libs/okio-1.6.0.jar
 includes=**
 jar.compress=false
diff --git a/src/com/annimon/ownlang/Main.java b/src/com/annimon/ownlang/Main.java
index b24e929..eb15b65 100644
--- a/src/com/annimon/ownlang/Main.java
+++ b/src/com/annimon/ownlang/Main.java
@@ -7,7 +7,6 @@ import com.annimon.ownlang.parser.Token;
 import com.annimon.ownlang.parser.ast.Statement;
 import com.annimon.ownlang.parser.visitors.AssignValidator;
 import com.annimon.ownlang.parser.visitors.FunctionAdder;
-import com.annimon.ownlang.parser.visitors.VariablePrinter;
 import java.io.IOException;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
@@ -19,7 +18,17 @@ public final class Main {
 
     public static void main(String[] args) throws IOException {
         if (args.length == 0) {
-            run(SourceLoader.readSource("program.own"), true, true, true);
+            try {
+                run(SourceLoader.readSource("program.own"), true, true, true);
+            } catch (IOException ioe) {
+                System.out.println("OwnLang version 1.1.0\n\n" +
+                        "Usage: ownlang [options]\n" +
+                        "  options:\n" +
+                        "      -f, --file [input]  Run program file. Required.\n" +
+                        "      -a, --showast       Show AST of program\n" +
+                        "      -t, --showtokens    Show lexical tokens\n" +
+                        "      -m, --showtime      Show elapsed time of parsing and execution");
+            }
             return;
         }
         
@@ -83,7 +92,6 @@ public final class Main {
             return;
         }
         program.accept(new FunctionAdder());
-//        program.accept(new VariablePrinter());
         program.accept(new AssignValidator());
         try {
             measurement.start("Execution time");