Fixes for issues 241, 273, 274

For 241:
1. Added the recommended entry in app.yaml for task queues as suggested by The Rook in his original post for issue 241.
2. Note that I was not able to replicate the spam email problem when the application is deployed on GAE the spam request got a 403, and was not processed by any instance. After adding the fix defined above, a 302 is returned, and spam request is still not process by any instance.

For 273 and 274 the actual changes to base.html are:
1. Additions on lines 57 and 127
2. Modification on line 61 (old) / 62 (new), adding "collapse" in the class.