Trim and session vars
* radmin/autocomplete_light_registry.py
  remote_start/forms.py
  -- Added a trim specifier to the main form
* remote_start/templates/select_car.html
  -- Added in error output if an invalid car was supplied
* remote_start/views.py
  -- Now it actually verifies the car, sets session vars, and moves on
  to the select parts page.  Which isn't built yet.