Added support for repeated key value pairs through use of NSSet
Merge pull request #778 from Neonkoala/master

Support for repeated key value pairs in URL encoded forms
Fixed comment typo

Minor typo.
Merge pull request #786 from tewha/patch-9

Fixed comment typo
Ensure content type for path extension doesn't return null
Merge pull request #792 from zachwaugh/master

Fix content type for extension from returning null
[Issue #791] Matching operations on request URL path rather than absolute URL string
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Merge branch 'master' into percent-escape