MDL-33057 JS: Complete rewrite of dnduploade code
 more dnd
more
almost working - preview still a but fudgy
changing some preview code
more
MDL-33057 JavaScript: Add dndupload-loader
fixup! MDL-33057
MDL-33057 JavaScript: General tidy up
fixup! MDL-33057 - more dnduiploader
more dnd
MDL-33057 JavaScript: Add documentation for attributes
arrrrgh
more
more arghirsm
more tidying up
more
more
course more
more stuff