PILBackgrounds - disable for iOS prior to 6.0
Fix ByFolder post-play navigation

Reference:
https://forums.plex.tv/index.php/topic/129936-menu-navigation-problems/
Do we really need this “volatile=*” everywhere?
Unplayed/partiallyPlayedDot is not shown in Grid view!
tweaks on aTV2 installation instructions
add short note on PILBackgrounds
Merge pull request #2 from iBaa/master

Update base.html