Issue #125: Add status endpoint
Issue #125: Add host information to status endpoint
Issue #125: Move status URL routing to the status module
Adapt for elliptics binding > 2.24.19
Fix compatability with elliptics api
Add some options to elliptics backend configuration.

Describe options. Also add links to documentation.
Add Elliptics backend description in README.md
Move example to README.md
Timeout env vars added to run.sh
Add smtp_port option in config.email_exceptions
Merge pull request #171 from zwischenzugs/gunicorn_timeout_env_args

Timeout env vars added to run.sh
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