Front-end cleanup

* Killed location style file.
* Cleanup on Logged in nav.  Logged out nav still nasty.
Logged out links look better now.
Re-enabling Angular app.  Dealing with explosions there in.
This ensures the rails controller is responding correctly...but I do not like it.  Need to clean this up.
Location creation works again.

* Implemented Angular's special XSRF-TOKEN session cookie to protect against CSRF
* Using strong_parameters to create/update locations.