Initial code to make FlipView MVVM friendly.
Reworked PrepareContainerForItemOverride

Stole some "PrepareContainerForItemOverride" code from MetroTabControl.cs.
Oops. ItemsTemplateSelector should work now.
When clicked, the FlipView should focus.
Basic, psuedo-mouseover glow.
Better glow thingy. Added Orientation.
Rebase madness.
Slight visual glitch fix.
Merge pull request #1040 from Amrykid/flipview-v2

[WIP] FlipView v2