[1.2.1] Improved factorial precision.  Cleaned up code in updateDisplay method.
Merge branch 'features/1.2.1' of https://github.com/edenwaith/EdenMath into features/1.2.1

Conflicts:
	EMResponder.m
	EdenMath.xcodeproj/admin.mode1v3
	EdenMath.xcodeproj/admin.pbxuser