Contributing cloud parts

[Leo Arias]

Done. But note that the parser runs every hour, so you will have to
wait to see it. If everything goes well, a little after the hour you
can run snapcraft update && snapcraft search liri to check it.

We know that our remote parts workflow is lacking. If you have
suggestions or complaints, filing bugs for those would be really
useful: https://bugs.launchpad.net/snapcraft/+bugs?field.tag=wiki

thanks Tim!