Updated overall app style - theming and drop down primarily.
Merge branch 'UI_Overhaul' of github.com:hudl/hudl-win8 into origin_UI_Overhaul_2
Changed gridview item accent color
Added App Bar to section page.
Styling app bar. Added visibility bindings for controls. Added bool binding for app bar open
Merge remote-tracking branch 'origin/UI_Overhaul_DownloadsViewChanges' into UI_Overhaul_DownloadAccessorUpdate
Downloads now start - need to work on logic for when a download finishes