Add #delete and #delete! to the JobBatch class. As a part of that it adds Lua#delete! and some new lua methods
Give the test context a real description.
add JobBatch#in_terminal_state?
Remove unused local.
This is intermittent on JRuby.

Not sure why, but I don't care enough to track it down.
Remove unused local.
fire_double is deprecated in favor of instance_double.
Reduce duplication using closures.
Merge pull request #57 from seomoz/delete-job-batch

JobBatch deletion