Gradle: enhance clean tasks in vtm web apps

vtm-android-example/src/org/oscim/android/test/MarkerOverlayActivity.java

@@ -55,7 +55,7 @@ public class MarkerOverlayActivity extends BitmapTileMapActivity
         super.onCreate(savedInstanceState);
         mBitmapLayer.tileRenderer().setBitmapAlpha(0.5f);
 
-        // Long press receiver
+        // Map events receiver
         mMap.layers().add(new MapEventsReceiver(mMap));
 
         /* directly load bitmap from resources */

vtm-web-app/build.gradle

@@ -82,3 +82,7 @@ tasks.withType(JavaCompile) { compileTask ->
     compileTask.dependsOn copyVtmAssets
     compileTask.dependsOn copyWarSources
 }
+
+clean {
+    delete "assets"
+}

vtm-web-js/build.gradle

@@ -85,3 +85,7 @@ tasks.withType(JavaCompile) { compileTask ->
     compileTask.dependsOn copyVtmAssets
     compileTask.dependsOn copyWarSources
 }
+
+clean {
+    delete "assets"
+}