Update codemirror to 4.7.0
Merge pull request #37 from Carreau/cm4.7

Update codemirror to 4.7.0
Remove bootstrap-tags
Promise ES6 polyfill
Merge pull request #42 from ipython/remove-bootstrap-tags

Remove bootstrap-tags
Merge pull request #43 from ipython/promise

Add es6-promise
remove highlight.js

Use CodeMirror.runMode to highlight in IPython
remove fabfile, since a vanilla `bower install` is now sufficient