Moved DummyTest to DummyTests class
Removed MainViewModelTests class
Moved Moq example to wiki
Added IMessageDialogService interface
Added MessageDialogService class
Added Windows Phone toolkit nuget package
Implemented MessageDialogService
Added MessageDialogService to Bootstrapper
Show exit confirmation dialog in OnClose command
Merge pull request #32 from bukal260/windows_phone

Create MessageBox dialog service; Handle app exit event and display message