Users can associate a performance with a solicitation

*Users can create a new solicitation
*Users can view a solicitation
*Users can view all solicitations  grouped by customer
*Users can add a performance to a solicitation
*Users can view associated performances from the solicitation page

@christopherThorsen, @GarthGoldwater - please have a look
Likewise, I don't think it needs to be dependent destroy since they can exist independently.