Changes made to support AFNetworking 2.0
Changed path to AFNetworking header to fix operation w/ cocoapods
Change the podspec to support AFNetworking 2.0.
Merge pull request #1 from gillygize/master

Change the podspec to support AFNetworking 2.0.
added response object to auth call
Merge pull request #2 from micahnyc/master

added response object to auth call
storeCredential:withIdentifier extended to allow selection of security accessibility while providing a decent default.

Conflicts:
	AFOAuth2Client/AFOAuth2Client.m