-Added google play services (needed for some stuff)

-Added new screen resizing options, stretch_2d is removed, new much more flexible ones.
-Fixed bug in viewport (can create more instances in 3d-in-2d demo now)
-Can set android permissions and screen sizes manually in the export settings
-Changed export templates extension to .tpz (too many people unzipped the manually..)
-File dialog now ensures that the proper extension is used (will not allow to save without it)
-Fixed bug that made collision exceptions not work in 2D

servers/visual_server.h

@@ -592,6 +592,7 @@ public:
 
 	virtual void viewport_attach_to_screen(RID p_viewport,int p_screen=0)=0;
 	virtual void viewport_detach(RID p_viewport)=0;
+	virtual void viewport_set_render_target_to_screen_rect(RID p_viewport,const Rect2& p_rect)=0;
 
 	enum RenderTargetUpdateMode {
 		RENDER_TARGET_UPDATE_DISABLED,
@@ -611,6 +612,8 @@ public:
 	virtual void viewport_queue_screen_capture(RID p_viewport)=0;
 	virtual Image viewport_get_screen_capture(RID p_viewport) const=0;
 
+
+
 	struct ViewportRect {
 	
 		int x,y,width,height;