reprepare assets on rebuild

templates/js-template-default/frameworks/runtime-src/proj.android-studio/app/build.gradle

@@ -47,3 +47,23 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile project(':libcocos2dx')
 }
+
+
+task cleanAssets(type: Delete) {
+    delete 'assets'
+}
+task copyAssets(type: Copy) {
+    from('../../../cocos2d-x/cocos/scripting/js-bindings/') {
+        include 'script/**'
+    }
+    from('../../../../') {
+        include 'res/**'
+        include 'src/**'
+        include 'main.js'
+        include 'project.json'
+    }
+    into 'assets'
+}
+
+clean.dependsOn cleanAssets
+preBuild.dependsOn copyAssets