Added test to ensure lock is released on subclass job failure

USERGRID-1495
Merge branch 'USERGRID-1495' of github.com:apigee/usergrid-stack into USERGRID-1495

Conflicts:
	scheduler/src/test/java/org/usergrid/batch/job/SchedulerRuntimeTest.java
Merge pull request #115 from apigee/USERGRID-1495

Usergrid 1495