fix column name to deal with different naming strategy
fix invalid annotation
fix joincolumn annotation
correct ref column name
Merge remote-tracking branch 'upstream/master' into fix-column-name

* upstream/master:
  adds an index for the job-queue runner
  adds safe object type for stack traces (closes #19)
  fixes variable name
  add runTime and closedAt to overview/detail

Conflicts:
	Entity/Job.php
Merge pull request #30 from tunght13488/fix-column-name

Explicit specify column name to deal with different naming strategy (underscore)