Added method to NSData+SDExtensions to get the string representation of an NSData object.
Merge branch 'master' of github.com:setdirection/ios-shared
Added API for authentication with a fallback block

Updated previous API to remove the useTouchID parameter.
Merge branch 'master' of github.com:setdirection/ios-shared
Updated comment
Merge branch 'master' of github.com:setdirection/ios-shared
Merge branch 'sd-master'