module flag being ignored when mix coherence.install --reinstall

[jeffdeville]

I've got an overridden module name, which breaks when I reinstall, because while coherence.install.ex.do_config\2 works just find, do_run(%{reinstall: true} = config) basically throws that parsing out, and calls 'run' over again with just the config info from :coherence, :opts. This then loses your other overrides. In my case, the loss of the 'module' option screws up the coherence_mailer.ex.