Preprocessor macros to disable TouchID on simultaror

Added some macros to disable LocalAuthentication when building for simulator. With this macros, TouchID is disabled but the rest of code works & can be executed on the simulator  (useful and mandatory for testing & taking screenshots when you don't have all devices)
Merge pull request #92 from guillermomuntaner/patch-1

Preprocessor macros to disable TouchID on simultaror