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
Add smtp_port option in config.email_exceptions
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
Added support for repository/json. Data parsed from the user-agent
Add smtp_secure option in config.email_exceptions