Added some crews to factories.
Created the set of UserAccount factories.
Renamed view specs according conventions.
Created view spec for user_accounts/new view.
Created specs for user_accounts/show view.
Extracted styles for user accounts to the separate file.
Created specs for user_accounts/request_to_activate view.
Created spec for sessions/new view.
Added spec for hidden field in request_to_activate view.
Create view specs for participants/_form view.