Purge xcode build for way out of date version of xcode
Moderenize the Xcode build for Xcode 5.1, using OS X 10.8 as the base.
Merge branch 'master' into 20140408-ktg-cleanup-xcode to stay up to date with other build changes and gitignores.
Removed zerolink due to bad experiences
Went back to supporting 10.8 SDK by default as part of ezRETS downstream support. Can be overridden by a developer if needed.
Merge branch '20140408-ktg-cleanup-xcode'