BUGS: There are some massive issues with the front page. Double-printing notices is a prominent one, along with having session storage issues if the database is reset. (session[:user_id] is stuck). Also, we need to fix the 1#_=_ thing.

Changed Venmo authentication flow, reorganizing controller and integrating it with the model. Everything works now.
Merge branch 'master' of https://github.com/harry-sanabria/hackPrinceton2013TeamGDT-

Conflicts:
	GroupBuy/db/schema.rb