Bumping version to 1.3.1

Bumping version to 1.3.0

Updating release notes

Bumping version to 1.2.1

Updating CHANGES for 1.2.1

Bumping version to 1.2.0

Bumping version to 1.1.0

Adding release notes for 1.0.1

Updating podspec to 1.0

Updating podspec to 1.0RC4

Merge branch 'master' of github.com:AFNetworking/AFNetworking

Merge branch '1.0RC2'