return null when no job for id in db
test
throw exception
test
Fix: Don't delete buried or deleted jobs if lifetime is set to unlimited
fix exception class name
Merge pull request #46 from basz/fix-incorrect-class-reference

fix exception class name
Add tests
Fix indentation
Merge pull request #42 from basz/issue/41-peek-return-for-non-existatnt-job

Issue/41 peek return for non existatnt job
Merge branch 'patch-1' of github.com:glen-84/SlmQueueDoctrine into glen-84-patch-1

Conflicts:
	src/SlmQueueDoctrine/Queue/DoctrineQueue.php