-------------------
* Added a Vagrantfile, improved documentation, and made some UX fixes.
* Read auth header from settings vs. hard-coded inside of user_proxy
command (fix 57)
* User proxy now also defers to default values from within settings.py
* Added a vagrant directory containing a Vagrantfile to bootstrap NSoT
in a self-contained virtual machine
* Added a new 'assignments' endpoint for Networks, to tell where they
are being
assigned to Interfaces.
* Added new nsot.utils.stats and ability to calculate network
utilization.