add jrebel to git ignore

Change-Id: I28903f0ecbd360fffbd93a259c253a9c8d6ecee3
but the JAMon monitor.stop in finally blocks, so they are stopped when an exception occurs

Change-Id: I7f23eabcd49a87a46943ec6082587cfee8d5f1b9
Merge pull request #4 from salandur/master

update stop of JAMon monitors in a finally block