Update README.md

updating instructions for running
Big-ass commit (sorry for not splitting up, it's getting late...)

Implements the changes discussed in this thread: https://groups.google.com/forum/#!topic/camus_etl/WhlpJmwVDVI

Also includes an example implementation of a simple enum-based schema registry in the com.example package
Merge branch 'master' of github.com:linkedin/camus