v1.5: Adds support for background image brush

v1.5 bug fix before nuget publish

v1.4: Adds Windows Phone 8 Accent and brush fixes

Background image functionality

Added code so you can set an image as background for all pages.
Use it like this: 

ThemeManager.SetBackground(new Uri("Images/AppBackground.jpg", UriKind.Relative));

v1.3.3

updating to 1.3.3 which is now on nuget