To replace failed release 2.0.2

Library updates

bidi extension uses :jig.web/context

Releasing in current state. Point releases can fix up examples and do…

…cumentation.

Jig protocol separated from system

Changing priority of config loading.

Add core.async support

RC3 failed to deploy to clojars, attempting with RC4

MQTT example added, some more extensions brought up to 2.0.x

Just testing the release, not ready for us.