Tagging 2.6.0

Tagging 2.5.4

Bumping version to 2.5.3

Bumping version to 2.5.2

Add NS_DESIGNATED_INITIALIZER for earlier versions of Xcode.

NS_DESIGNATED_INITIALIZER is not included in Xcode 5. Since there's no common header, I just inserted a definition for it into each file that uses it.

See: http://stackoverflow.com/questions/24119896/ns-designated-initializer-expected-colon

Bumping version to 2.5.0

Bumping version to 2.4.1

Bumping version to 2.4.0

Bumping version to 2.3.1

Fixing imports in AFHTTPSessionManager