Update README.md

Moved USAGE documentation to the wiki
Work in progress toward improving API for applications.  Updated to use
Spring Framework 3.2.1 since it includes a new cool controller unit test
where we can simulate HTTP requests.
Cleaned up some imports.
Added more integration tests, improved /thing API, ensured follow and
unfollow working.
Implemented event queries, reworked real time events, added unit tests
for visually checking results.  Lots of cleanup work to do but mostly
works.
Formatting
ignore active-mq data generated
Merge branch 'master' of git@github.com:ubc-magic/thingbroker.git
More unit testing, optimize delete somewhat.
Merge branch 'develop' of local repository into api_cleanup