First draft of arc code
Use globals and add logic for fills and strokes
Add inline documentation for arc
Making files jslint approved for arc
arc sans comments, recovered from file so pull request is not moot.  Recovering comments next
adding comments
loadStrings() and loadJSON() fixes for preload()

I incorporated brysonian's loadJSON function and approach to preload()
(linked below) so that loadStrings and loadJSON work in preload without
callbacks.

https://gist.github.com/brysonian/7298465
https://github.com/lmccart/p5.js/issues/81
Update p5.js

added a semicolon
Cleanup
merging arc