Documentation fixes and tweaks
`duration`option designated as experimental
Renamed the two realtime image switching examples to comply with the rest
Revised sequence switching example
Revised sprite switching example
Improved examples index
Detection of instance visibility within viewport and muting of the tick event when not visible
Slimmed the off screen check down a bit
Of course tests have Reels well off screen, and I'm sure there will be many occasions in the wild, which wouldn't fancy this CPU conservation feature, so in such cases set `$.reel.intense = true` and the off screen check will be omitted.
CPU conservation update
Merge branch 'viewport-based-disable' into development
Timestamped and compiled
Fixed a failed logic when testing CSS URL matches
Elevated default test jQuery to 1.10.2