title: StructureMap: How to use more than one concrete Class per Interface
body: <p>How can I figure StructureMap to use more than one concrete Class per Interface.
  i.e. an IRepositoryCustomer is implemented by: RepositoryCustomerA and RepositoryCustomerB</p>
  
  <p>How do I register and resolve this to/from the StructureMap IoC container?</p>