Fix a typo in the README
Add ruby 2.1 to travis build.
Fix brittle test.
`debugger` won't install on ruby 2.0+.
Singleton classes are included in `ancestors` in ruby 2.1.
Use something more intention revealing.
Merge pull request #182 from seomoz/add-2.1-to-build

Add ruby 2.1 to travis build.
Improve RetryExceptions middleware to support exception-dependent backoffs.
Merge pull request #184 from seomoz/pass-error-to-backoff-strategy

Improve RetryExceptions middleware to support exception-dependent backoffs
Update to qless-core master.
Add a `Job#spawned_from` method.
Merge pull request #189 from seomoz/spawned_from

Spawned from
Pull in qless-core version that provides requeue.
Rename `move` to `dequeue`.
Use new `requeue` qless-core command.

This ensures that you’ll get an error if the job has
already been cancelled, rather than resurrecting it.
Merge pull request #192 from seomoz/use-qless-core-requeue

Use qless core requeue
add after_retry callback handler for RetryExceptions middleware
add an after_requeue callback to RequeueExceptions
check block.nil? instead of block_given?
only allow one callback and provide explicit method for setting callback