[Bug 905834] Developer Vagrant environment

This adds an option to deploy kitsune via Vagrant with Ubuntu 14.04. 

* ./manage.py generatedata does not currently work, not sure why. Was planning on using an anonymized dump of the production database for data.
* Also, this is blocked until the requirements update in #1984 is merged as well.
Also maybe switch this to:
```
LESS_BIN = path('node_modules/.bin/lessc')
```