check in
Merge branch 'master' of github.com:lmccart/p5.js
adding addclass and removeclass fxns
fixing keyboard stuff, addnig examples
addclass remove class tweaks
updates to dom
 doc
adding fullscreen fxn closes #197
updating docs
updating examples for dom
cleaning things up with canvas and context
adding p5.graphics
fixing millis test, cleaning up remove
adding blendmode
merging upstream changes
consolidated and moved example audio to _files folder