Use namespace for gradle projects to fix deprecation warnings.

templates/extension/dependencies/android/build.gradle

@@ -12,6 +12,7 @@ buildscript {
 apply plugin: 'com.android.library'
 
 android {
+	namespace "org.haxe.extension.::extensionLowerCase::"
 	compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)
 	buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION
 }

templates/extension/dependencies/android/src/main/AndroidManifest.xml

@@ -1,6 +1,2 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.haxe.extension.::extensionLowerCase::" >
-	
-	
-	
-</manifest>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.haxe.extension.::extensionLowerCase::" />