[FIX][MOD] Code review fix, code cleanup.
Merge branch 'wp.logon.pages' into wp.logon.logic.pages

Conflicts:
	windows-phone-client/Ctf/Ctf/Communication/Login.cs
	windows-phone-client/Ctf/Ctf/Pages/MainPage.xaml.cs
[MOD] MainPage messagebox modification after recent changes
[FIX] Fixed register fields clear after failed register action
[FIX] Fixed clear information on login and registration field requirements