Updated layer file-tree json schema, support for xz/lzma and cache on push
Added diff-worker
Try to read in redis settings from docker link variables
Added worker cooperation and comments
Refactored for pep8
Layer related unit tests
Use new redis configuration. Remove timeout for workers
Add lzma to TravisCI prerequisites
Reduce line length for pep8
Use TitleCase for layer_archive context manager
Don't default redis config options from environment
Remove irrelevant FIXME
Replace print statements with logging calls
Update layer tests with new imports
A few pep8 corrections
Pin backports.lzma version to 0.0.2
Remove sitepackages from tox config
Added secondary non-lru cache. Renamed original cache to reflect lru-ness. Updated sample yml config
Remove unneeded lru specific helper methods
Merge pull request #174 from dustinlacewell/diff-worker

Diff worker