updated documentation and method naming NSObject+Annex category to be more clearer, added main thread block execution to NSObject+Annex, added tests for NSObject+Annex, cleared warnings in AnnexKeychain
returned old methods replaced in NSObject+Annex as deprecated methods and added Annex prefix to block types
Merge pull request #5 from jlalvarez18/master

Updates to NSObject+Annex with tests