Add kotlin class path to gradle file

Author: bloderxd

build.gradle

@@ -2,13 +2,15 @@
 apply plugin: 'com.jfrog.bintray'
 
 buildscript {
+    ext.kotlin_version = '1.0.3'
     repositories {
         jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.0.0'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.4'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files