Ingest charms in parallel.

This branch also includes the ability to limit the number of charms/bundles
that charmload tries to publish.

Also fix a time UTC issue causing tests to fail locally.
Up to 10 default publishers. Make tips processing receive a channel.
Avoid loggign uauthorized errors twice.
Update to the new lpad code organization.
Fix typo in lpad params description.
Merge pull request #107 from frankban/concurrent-ingestion

Ingest charms in parallel.

This branch also includes the ability to limit the number of charms/bundles
that charmload tries to publish.

Also fix a time UTC issue causing tests to fail locally.