Merge pull request #79 from PrzemekSzyszka/windows_phone

[WP] URBNG-299 Provide unit tests for ViewModel and URBNG-323 Create view (GPS Task)
fixed webServiceMock - now we use one collection of games in entire mock
fixed Join/Leave game flows
fixed appbar on game details view
Merge pull request #84 from adamwalocha/windows_phone

fixed webServiceMock - now we use one collection of games in entire mock
[WP] URBNG-326 Create ABCD task details
+ StateManager
+ Created connection between ABCDPossibleAnswer and ABCDUserAnswer
+ Custom indeterminate progress bar