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
Garth, that's only gonna save me like 6 characters on this line, add a bunch more code to my controller, and I'm not calling this method often.