Merge pull request #139 from Maxikq/windows_phone

URBNG-149 - [WP] "Game changed" notification
URBNG-287 Create registration UI
URBNG-288 Create view model fror registration with email validation
URBNG-289 Implement user credentials autosave and clear options
URBNG-293 replace mockup login/logout on game list view model
URBNG-512 implement logut and clear secured vault
URBNG-513 implement initial sync for user who already has his account
+ Webservice operations into GameAuthorizationService
Merge branch 'windows_phone' of https://github.com/blstream/UrbanGame into windows_phone

Conflicts:
	UrbanGameWP7/UrbanGame/AppBootstrapper.cs
	UrbanGameWP7/UrbanGame/Localization/AppResources.pl-PL.resx
	UrbanGameWP7/UrbanGame/Localization/AppResources.resx
	UrbanGameWP7/UrbanGame/ViewModels/GameDetailsPreviewViewModel.cs
	UrbanGameWP7/UrbanGame/ViewModels/GameDetailsViewModel.cs
	UrbanGameWP7/UrbanGame/ViewModels/LoginAndRegistrerViewModel.cs
	UrbanGameWP7/UrbanGame/ViewModels/TaskViewModel.cs
	UrbanGameWP7/UrbanGame/Views/LoginAndRegistrerView.xaml
	UrbanGameWP7/WebService/GameWebService.cs
	UrbanGameWP7/WebService/GameWebServiceMock.cs
Change bool CheckCredential to async task LoadUserData
Comments fix
- MessageBox
Merge pull request #147 from PrzemekSzyszka/windows_phone

[WP] URBNG-134 Account management
URBNG-519 - [WP] Implement queue of toast notifications
also:
* fixed TaskView header
* disabled back button while sending solution
* deleting old solutions - only the latest is stored in db