Add teams table to db
Add Team model
Add foreigner dependency
Using PostgreSQL for all environments
Updated schema.rb for postgresql
Add memberships join table to db
Add Membership model
Add associations to User and Team models
Make step even more generic to support singular and plural
Add teams routes
Extract user snapshots to partial
Implement teams controller and views
Add teams acceptance specs
Kill off all user routes, views & controller

* We're viewing users by team now. We may bring some user views back
  when user management is implemented, but for now let's loose the
  cruft!
Wrap snapshots controller spec in context
Add unauthenticated spec for snapshots controller
Move "unauthenticated" features to their own file

* The idea is that we'll get specs on all these features to show
  redirects happen when unauthenticated requests are made. This may get
  out of hand and need to be refactored again in the future...
Add simple_form dependency
Installed simple_form
Implement team creation