Update timezone test to use offset from GMT.
Update timezone test to use offset from GMT.

Conflicts:
	AirshipLib/AirshipLogicTests/UAPushTest.m

manuyavuz/ios-library,mikerowan/ios-library,ipmobiletech/ios-library,grosch/ios-library,ipmobiletech/ios-library,ipmobiletech/ios-library,mikerowan/ios-library,mikerowan/ios-library,zhangqinghe/ios-library,manuyavuz/ios-library,grosch/ios-library,manuyavuz/ios-library,zhangqinghe/ios-library,grosch/ios-library,zhangqinghe/ios-library