Issue 5981 - Adjust build.gradle to support Kotlin

adblockplussbrowser/build.gradle

 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
     buildToolsVersion rootProject.ext.buildToolsVersion
 
     compileOptions {
         sourceCompatibility = rootProject.ext.sourceCompatibilityVersion
         targetCompatibility = rootProject.ext.targetCompatibilityVersion
     }
 
@@ skipping 34 matching lines @@
 def updateBundledLists() {
     new URL(rootProject.ext.easyListUpdateUrl).withInputStream {
         i -> new File(rootProject.ext.easyListFilePath).withOutputStream { it << i }
     }
     new URL(rootProject.ext.exceptionRulesUpdateUrl).withInputStream {
         i -> new File(rootProject.ext.exceptionRulesFilePath).withOutputStream { it << i }
     }
 }
 
 dependencies {
+    testCompile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
     compile "com.android.support:support-v4:$rootProject.ext.androidSupportLibraryVersion"
     compile (group: 'commons-validator', name: 'commons-validator', version: '+') {
         exclude group: 'commons-logging', module: 'commons-logging'
     }
 }