Switch over to using GCD for thread safety in RHAddressBook. This could do with more testing before hitting master.
Wrap RH_AB_ENABLE_DEBUG_LOGGING and RH_AB_INCLUDE_GEOCODING in #ifndef to make it easier for others to override them without editing the project.
Disable Geocoding by default.
Merge branch 'gcd-thread-safety'
Update tests for 7.1.
Update projects settings for 7.1 and fix a few type conversion warnings.