URBNG-142 - [WP] provide changing of TaskView according to task state (accomplished/active etc.)
URBNG-142 - [WP] changed tasks are marked on the list until user opens it for the first time after the change
URBNG-142 - [WP] Mark changes in task as provided in UX spec

Also:
* GameDetailsView - fixed icons, colors etc.
* removed dummy tests
* fixed comparing dates by GameChangesManager
Merge pull request #161 from Maxikq/windows_phone

URBNG-142 - [WP] provide changing of TaskView according to task state (accomplished/active etc.)
Fixed review comment
[WP] URBNG-555 Format of the time left till the end of a task on the tasks' list differs from the one displayed on the details page for some tasks (changed converter)
[WP} URBNG-535 'Report task' button is not displayed
[WP] URBNG-531 Time left till the end of a task displayed on the tasks' list differs from the one displayed on the details page
[WP] URBNG-557 Obscured "join" button on registration screen
Merge branch 'windows_phone' of https://github.com/blstream/UrbanGame into windows_phone

Conflicts:
	UrbanGameWP7/UrbanGame/App.xaml
	UrbanGameWP7/UrbanGame/Localization/AppResources.Designer.cs
	UrbanGameWP7/UrbanGame/Localization/AppResources.pl-PL.resx
	UrbanGameWP7/UrbanGame/Localization/AppResources.resx
	UrbanGameWP7/UrbanGame/Views/GameDetailsView.xaml
	UrbanGameWP7/UrbanGame/Views/TaskView.xaml
	UrbanGameWP7/UrbanGameTests/Tests/WebApiTest.cs
	UrbanGameWP7/WebService/GameWebServiceMock.cs