Remove the ARC memory management macros that are already in the common stuff.
Add the SimpleOAuth2 class
Add a macro for making constants with a leading k also be "prefix"able. I.e. kSSKeychain as MCC_PREFIXED_CONSTANT(Keychain) becomes kPREKeychain.
Add a prefixing header for SSKeychain!
Add some error handling structure and also add Keychain support.