Clientside timeout [NOT FINISHED YET]

* Most of the logic is there
* Just need to implement how to handle end of session - e.g. clear form and take them to a new page?
* Implementation should go in endSesion function of app/assets/javascripts/session_timeout.coffee

The code is hooked up to show the dialog and end the session quite quickly for development purposes. Change
  sessionMinutes = 60
  warnMinutesBeforeEnd = 15
For prod deployment.