S3 based file uploading

Uploading working, but UI not implemented
Merge branch 'master' into feature/asset-hosting
DnD upload x-browser test + paste

Note that paste has buggy implemention in browsers: it only works in Safari + Chrome (not tested IE), and onlys with image data, rather than copying a file from your desktop and pasting - if you do this, you'll upload a png of the application's icon. Stupid, yes. Broken, yes. I may decide to kill paste support, but it's fucked in the head.

Also includes API to get total size of your bucket.
Remove crazy hard coded test!
First version of asset manager
Asset manager (del works)
textarea support
Fixed broken CM support
Merge branch 'master' into feature/asset-hosting

Conflicts:
	lib/routes.js
Merge pull request #1981 from jsbin/feature/asset-hosting

S3 based file uploading (under alpha)