Adding support for kSecAttrSynchronizableAny

Changed the synchronizable property to the type
SSKeychainQuerySynchronizable with the possible options of
SSKeychainQuerySynchronizableNo/Yes/Any.
Adding test for the synchronizable property
Renaming the SSKeychainQuerySynchronizable type

From SSKeychainQuerySynchronizable to SSKeychainQuerySynchronizationMode
Merge pull request #53 from blommegard/master

Adding support for kSecAttrSynchronizableAny
Happy New Year 
Fixed crash on iOS prior 7.
Merge pull request #60 from Eugene-Gubin/master

Fixed crash on iOS prior 7.
Better synchronizable checking. Closes #62. Closes #61. Closes #56.
Setup Mac tests
Clean up
Make any the default. Closes #55
Clean up for Mac
Fight with Mac tests