removed base_url from manifest.webapp

rails/config/manifest.webapp

@@ -2,7 +2,6 @@
 	"name": "Robots Are People Too",
 	"description": "RAPT is a complex and challenging HTML5 platformer.  The exit to each level is blocked by enemies that roll, jump, fly, and shoot to prevent escape at all costs.  Gameplay is exclusively two-player and uses a unique split-screen mechanic.  The levels and enemies are designed to promote cooperation between players.\n\nRAPT also comes with a powerful level editor which allows players to create levels of any size.  Levels are saved to the player's account on the server, which has a public page listing custom levels.  Link to this page to share your levels with friends.",
 
-	"base_url": "http://raptjs.com",
 	"launch_path": "/play/",
 
 	"developer": {