Changes

** '''Authentication''': there is currently no authentication in Litmus. We accept the first email address the user provides when testing, use this to build a cookie, and then never let them change it (without removing the cookie, of course). We need to implement proper authentication:*** mirror existing Bugzilla login information. This should be synced at some regular interval;*** allow users to login/logout from within Litmus;*** auto-populate all email fields with current credentials from cookie when present;*** redirect through login screen when login credentials are not present;*** redirect users without Bugzilla accounts to Bugzilla.