Code review comment for lp:~lifeless/lptools/upstream

This adds an lptools package and reduces some duplicate code; I also added a lp-milestones command with a 'create' command. I'll probably add a few more as I automate my release management process.

Oh, it uses bzrlib's command processing facilities, because they are awesome. You might say 'use commandant instead', but that isn't packaged yet.