Upgraded to Rails 3.2.

Other upgraded gems (for compatibility):
acts-as-taggable-on, database_cleaner.

More on the database-cleaner error we encountered:
https://github.com/bmabey/database_cleaner/issues/98
Fixed edit/update payment action

Starting with Rails 3.1, form_for needs to be evaluated.

Also changed submit label to be more consistant
Fixed error handling when payment is not found

Need to return after redirecting to avoid double redirect/render
error.
Upgraded to Rails 3.2.latest

Upgraded for security reasons. Stay abreast of future updates to rails
3.2.
https://www.pivotaltracker.com/story/show/41917559