Added fall-back path for NSData->NSString conversion.
SDDataMap updates

Added propertyType setter that properly splits out property and subtype.
Added description method to SDObjectProperty.
Added mergeDictionaries method to NSDictionary+SDExtensions.
Merge branch 'master' of github.com:setdirection/ios-shared
Removed SDMockService.*
Updated the project to remove SDMockService.*
Factored out NSData->NSString conversion.
Mocks now bypass cache entirely.
Merge branch 'setdirection-master'