Commands removed from bundles still marked as ambiguous

[nmohoric]

We've moved a command from one bundle to another, but you need to fully qualify the command still.

This shows up in two separate places, when trying to get help on the new command (https://github.com/operable/cog/blob/master/lib/cog/repository/commands.ex#L20 due to not checking for enabled I'd imagine) and when trying to run the new command (https://github.com/operable/cog/blob/master/lib/cog/queries/command.ex#L39 due to leaving around old commands in the db)