Merge pull request #31 from lucaswerkmeister/master

Updated special frames (fixes #30)
More missed special frames.
More missed special frames.
Stepping through frames will cause autoplay to stop.
Spell check readme FTW.
UI updates, fixes #34
Remove old preloading diff.
Fun-Stuff wrap all content. Increased Pixel Size.
Draw rectangle around special frames. Show grid.
Adapt background-Color. Remove Grid again.
Mark special frames in initialisation
Merge pull request #35 from MaPePeR/specialframe-preloadingindicator

Shows a Rect around the special frames in the preloadingindicator
All special frames get a yellow box on preaload indicator now.
Added a play in reverse options because why not?
Fixed reverse play speed change problem.
Clarify the off-by-one-problem
update jslint-globals
fix blurry indicator lines

Thanks to http://stackoverflow.com/a/9311835/2256700
Also declared a variable before using it.
Highlight currentframe in indicator
JSLinted navigation.js