Implemented a FlipView control.
FlipView control arrows borrow the chevron arrow design from MA.M.Resources.
Implemented banner.

Signed-off-by: Amrykid <amrykid@gmail.com>
FlipView now uses the *Direction*ReplaceTransitions.
Banner won't show if the BannerText is empty.
Banner buttons disable if they cannot be used.
FlipView further emulates Windows 8 behavior. Banner doesn't fade when the selection changes. It stays shown. BannerText changes are animated like the Windows 8 counterpart.
Banner is enabled by default.
FlipView spans to rows on the demo.
Show Banner Checkbox is now TwoWay.
Make setting the Banner text directly work. Removed BannerTextbox and now it is Selection based.
Banner doesn't care if there is text or not. Improved reliability for BannerText.
Merge pull request #472 from Amrykid/flipview

Implemented a FlipView control.