Fix ErrorImage not showing.
Minor code cleanup.
Merge pull request #598 from Cheesebaron/v3.1

Fixes for MvxImageView on Android not using ErrorImagePath. Thanks :)
Update _ Windows Store UI.txt for Win 8.1

Win 8.1 doesn't have LayoutAwarePage anymore
Merge pull request #605 from RobGibbens/v3.1

Update _ Windows Store UI.txt for Win 8.1
Merge pull request #6 from MvvmCross/v3.1

follow mvx update