[ALOY-816] deprecation warning for Ti.UI.iPhone.NavigationGroup, compiler error for Ti.UI.iOS.NavigationWindow

Ticket:
[https://jira.appcelerator.org/browse/ALOY-816](https://jira.appcelerato
r.org/browse/ALOY-816)
Merge pull request #238 from appcelerator/ALOY-816

[ALOY-816] deprecation warning for Ti.UI.iPhone.NavigationGroup, compiler error for Ti.UI.iOS.NavigationWindow