Added Sign in and Signout option to application layout

  * gem file in preparation for devise layout changes
Updated SeekersDevise Migration and initiatiated registrations controller

  * registrations controller will be utilized to redirect
   user to the profile page for completion after signing up
Fourth Feature Spec Complete: User can submit seeker profile

  * will be updated to allow for utilization of registration controller
User redirected to profile page after signing up

  * created registrations controller