Bump rspec-rails to 2.14.0

Fixes #3356
Update Font Awesome to version 3.2.1 with 361 icons total now available in admin

Fixes #3355
Remove items with quantity 0 on cart page

Read line removed in e07f4569f2dd63f411d81b6cf380140a73ac1de1 and add
spec to prove why it needs to be there for now

Fixes #3353