Mailer implementation

For #34 

This pull request adds in django email code, basically copied off of odalc. I also added in some utility functions that I found help keep the test code DRY. Technically, everything should work with emails when we set up heroku to actually do smtp.

Also, I added in some test code for revolv.base.utils (testing ftw, looks like travis is happy)
You could write a fixture for this and use it in the test. No need to change it now though.