Only digest 'class', 'queue', 'args', and 'at' keys for the payload.
Fixed core_ext requirement, fixed README, bumped version.
Slice if the hash contains the key, and only if not defined.
Merge branch 'feature/ignore_keys' of https://github.com/bnorton/sidekiq-middleware
Added CHANGES, version bump.
Fixed arguments passed to Hash#slice, version bump.
Update tests
Use locks namespace
Bump 0.0.6
Update to match Sidekiq 2.6.5
Merge pull request #6 from tjsingleton/fix_tests_for_sidekiq_2_6_5

Update to match Sidekiq 2.6.5
Issue #7
Scheduled jobs expiration time workarounds
Fixes #8
Issue #8: Revert changes
Working version of throttle middleware.

Some race conditions remain - see test. Should be fixed either with redis transactions or a lua script.
Make throttling threadsafe by using lua script.
Do not schedule manually - sidekiq client will schedule if setting an 'at' attribute.

Fixes "undefined method `[]' for true:TrueClass" since we are no longer returning the result of the zadd.