Merge pull request #142 from hudl/SliderStyling

Slider styling
Moved up video controls, aligned them, and removed extra space on left control
Adjusted video page controls, added prominence to play/pause button
Made the app bars sticky on the video page
Fixed issue with progress ring remaining active on section page when navigating back
Only the next angle will now be preloaded. Also fixed issue with grid header scrolling
Options and playback menu tweaks
Added carat to options menu button
Merge remote-tracking branch 'origin/Spheniscidae_Release' into Sphen_VideoPageFixes

Conflicts:
	HudlRT/Views/VideoPlayerView.xaml
Merge pull request #143 from hudl/Sphen_VideoPageFixes

Sphen video page fixes
Fixed colors on the options popup header
Merge pull request #144 from hudl/Spheniscidae_Release_PreloadNextAngle

Only the next angle will now be preloaded
Fixed back button on section page
Merge pull request #145 from hudl/Sphenicidae_Release

Fixed back button on section page
Merge branch 'Spheniscidae_Release' of github.com:hudl/hudl-win8 into SliderStyling

Conflicts:
	HudlRT/Views/VideoPlayerView.xaml.cs