#130 - Make rspec exit after successful run.

For the tests, we load the Spring application context, which starts
activemq, ehcache, h2, etc. which start daemon threads, which do not
allow rspec to finish (and exit) once the tests are done (when run
using autorun).

Explicitly exit with the status code.
Merge pull request #176 from arvindsv/master

#130 - Make rspec exit after successful run.