Adding Concurrent suite and annotations.
USERGRID-1872, USERGRID-1872:

  o Making Jetty fire up on available port if default not available
  o Making Jersey use Jetty's port

NOTE: we can now run separate vm's in parallel and prevent collisions
from port conflicts howerver the same may not be the case for the
webapp itself - wondering if we can share the same webapp directory
in these cases.
Fixing some issues that were resulting from running the methods
as well as the class in parallel. This configuration passes the
tests in under 5 minutes:

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4:52.589s
[INFO] Finished at: Sat Aug 10 06:45:21 EEST 2013
[INFO] Final Memory: 49M/953M
[INFO] ------------------------------------------------------------------------