Support error_classes and max_attempts on per-item basis
Add some tests and support for BatchingQueue
Bump version
Fix syntax error
Make IsolationQueue work
Whoops, deleted the whole thing
Test custom error classes
Ragh
Add Redis to Travis config
Review fixes
Make a big function a little smaller
Merge pull request #33 from gamechanger/tnt-per-item-retry

Add per-item retry count and error classes