Add kotlin to app gradle file

Author: bloderxd

magic/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 apply plugin: "maven-publish"
 apply plugin: 'com.jfrog.bintray'
 apply plugin: 'com.github.dcendents.android-maven'
@@ -23,6 +24,9 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
 }
 
 install {
@@ -105,4 +109,8 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
     compile 'com.android.support:appcompat-v7:23.1.1'
+    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+}
+repositories {
+    mavenCentral()
 }