Rename adapters:
   dojo.jsPlumb -> dojo-adapter
   jquery.jsPlumb -> jquery-adapter
   mootools.jsPlumb -> mootools-adapter
   yui.jsPlumb -> yui-adapter
since the original file names don't work with AMD.
Also, introduce main.js (not working yet).
Remove AMD name conflict with demo.js and demo.css
Added AMD to some more files.
Working on getting AMD to load.