Genome::Process

`Genome::Process` serves as a holder of metadata related to commands that run workflows.  It is in some ways a stripped down `Genome::Model::Build`.  It will make possible `genome model build view` like views for things such as `Genome::VariantReporting` or the data importing commands.
I was using it for a while, but when I switched to the time-stamps being set by the `update_status` method I took it out, mostly because an `updated_at` field seemed to be of little utility.