[ThreadedCoreData] Fix selector usages wrt new registrar [#18344]
Add NSZombieApocalypse sample
Change TicTacToe to be Portrait only
Renaming Sample, formatting markdown better
[AppPref] Properly override the Window property of AppDelegate
RosyWriter: Make portrait only

Fix error from vertShader and fragShader not being initialized before use.
Rebuilt Hello_Universal/WorldCities with XS stable 4.2.3, to fix the issue reported in Bug 1842. This is also required to execute automation test in testcloud since UIDeviceFamily in Info.plist is checked to decide supported platforms
Merge branch 'master' of github.com:xamarin/monotouch-samples into monotouch-7.2.1
[MidiTest] Merge changes from Miguel

Show notes being played usign async, remove redundant and useless stub code