Add nginx reverse proxy to apache in Vagrant VM

Accessible at port 9001.
Add gunicorn to Vagrant VM
Automatically start dev server in Vagrant VM
Docs: Explain changes to Vagrant VM
Merge branch 'master' into issue/602/vagrant

Conflicts:
	.gitignore
	Makefile
Fix some Vagrant issues

* Revived the Apache config deleted in 974187
* Fixed the MySQL packages bug with a hack
* Fixed a warning about the python-dev package being duplicate

There's probably more issues with the Vagrant machine. But this is good
enough to make it to master.
Merge pull request #602 from tangentlabs/issue/602/vagrant

Vagrant: add support for testing Oscar under different servers