Break out SSH tasks into their own gem
Make the gemspec task a little smarter
Allow a task to declare its queue as persistant.
After some further consideration, the intervalexpression pieces aren't
necessarily dependent upon symphony core -- breaking the scheduling
components out.
Complete the intervalexpression backout.
Branch merge from 221b25852ba6.
Remove the ssh-related dev deps
Set cancel-on-failover flag to the queue consumer
Update the TO-DO list
Bump the minor version, update history