Fixes issue of accent color not applied to WP8 controls

In Windows Phone 8 the accent color is used in controls for pressed and
focused states.  Due to how resources are evaluated any resource based
on accent color needs to be specifically set. Also renamed the
SetColorAndBrush() method to be more accurate.
Merge pull request #10 from shawnoster/master

Fixes issue with SetAccentColor() not fully styling WP8 controls like edits, checkbox, etc.