Remove session model and references to session model, drop sessions table
Add date_indices model as base for sessions table
Update index creation to specify uniqueness
create administration page and associated tests
Update admin controller
Updated gems
Add method for getting unique items from locations table
move application_helper include up to the top level controller to make methods available in all controllers
Add factory to create operating sessions
Create operating session model, controller and views (new, show)
Redesign surgeon creation view.  Improves layout
Remove puppet
add new vagrant
Change db to Postgres
Add gems for therubyracer and execjs
reorder Gemfile
fix error in db config
speed up tests by optimizing bcrypt