Add less support for main page.
Add basic angularjs directive for producing 8bit panel divs.  Bring in bootstrap3 (just mixins for now).  Add some placeholder stuff.
Toggle html divs when not on splash screen (HACKS)
Update 8bit panel style, and hide 256challenge divs.
256px challenge page skeleton.
Move ImageProcessor into core.  Use to isolate screen overlay sprites, and render previews in drop canvas.
Use ImageProcessor for overlay in twofiftysix
Add minecraftia font for 8bit goodness.
Update twofiftysix page to support drag/drop images.  Non-functional prototype for challenge interface.
Merge branch 'two-fifty-six-challenge'
Note about using images.