Simplify CargoBayProductRequestDelegate init

Success and failure blocks are `(copy)` properties, no need to redefine them
Merge pull request #62 from vtourraine/patch-1

Simplify CargoBayProductRequestDelegate init
Updating AFNetworking dependency, and fixing deprecation warning

Bumping version to 2.1.0
[Issue #64] Unsetting delegate before unregistering
Fixing tests
Merge branch 'master' of github.com:mattt/CargoBay
Fixing OS X compilation warnings