Added GCC_SYMBOLS_PRIVATE_EXTERN=NO to allow tests to function properly.
Refactor of SDDataMap.  Added the ability to export SDModelObject's to dictionaries as well as an exportMappingForDictionary.
Reworked how dictionaryRepresentation works and made it compatible with the refactored SDDataMap.
Merge branch 'master' of github.com:setdirection/ios-shared
Merge branch 'master' of github.com:setdirection/ios-shared
Merge remote-tracking branch 'upstream/master' into rx-integration