Add Rename

Allow modules to be renamed by mutators.  This will allow modules to
dynamically adapt to the presence or absence of modules with the same
name.  For example, if a source module does not exist, a prebuilt module
could rename itself to the name of the source module so that
dependenices on the module name are satisified.

Change-Id: I44004604c6d9db041bb7d38fe6c1ca877bc7d6f1