INTEXT-64 MQTT Adapters

See README.md for more information.

http://jira.springsource.org/browse/INTEXT-64
INTEXT-64 - Polishing

* Update dependency versions
* Add more comments/links
* Remove DocBook usage
Merge pull request #40 from garyrussell/mqtt

* garyrussell-mqtt:
  INTEXT-64 - Polishing
  INTEXT-64 MQTT Adapters