remove browserify-shim, update readme

browserify shim is actually useless now when debowerify is one of the transforms. If a bower package for example doesn't have a 'main' field defined it's still possible to include it by requiring the main file  like require('bad-bower-lib/dist/bad-bower')
Merge branch 'master' into react

Conflicts:
	README.md
	gulpfile.coffee