Merge pull request #23 from blackboard/mongoskin-version

Lock mongoskin version so it won't auto-upgrade
Merge pull request #18 from oomathias/master

Add delay option
Job retries
Update job retry tests and prevent retry info from getting persisted to mongo if not provided
Exponential delay strategy. Switch from "retries" to "attempts".
Remove custom delayFunction support
Job timeouts
If the watchdog finds a timedout job, have it check again immediately for more to work through a potential backlog of timed out tasks
If an error occurs when updating a timed out job, keep the watchdog going
Remove watchdog
Add watchdog
Merge branch 'retries' into blackboard

Conflicts:
	lib/job.js
	lib/queue.js
	test/test_retries.js
Merge branch 'timeouts' into blackboard

Conflicts:
	test/test_timeout.js
Merge branch 'watchdog' into blackboard