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 support for config files outside of the source directory

Config files can be specified now with absolute paths with the
DOCKER_REGISTRY_CONFIG variable, for example:

export DOCKER_REGISTRY_CONFIG=/etc/docker-registry.yml

This was initially reported in RH Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1038874
Merge pull request #148 from goldmann/config_location

Add support for config files outside of the source directory
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