NGINX CONFIG: enable chunking, point out nginx-extras requirement
Merge pull request #143 from anapsix/nginx-config

NGINX CONFIG: enable chunking, point out nginx-extras requirement
Update README.md
Reduced the parallel key concurrency to 5
Removed incorrect prefix calulation (error when root contains trailing slash), to prefer input.
Checking auth for repository regex, if local then a private repository may not be specified.
Fixed the typo
Merge pull request #149 from Kroisse/fix-typo

Fixed the typo
Moved config to the config/ directory (closes #144)
Added support for environment variable default value
Added exmaple for persistent storage to the readme.
Fixed pep8 warning
Merge pull request #151 from theopolis/edit_readme

Added exmaple for persistent storage to the readme.
Merge pull request #150 from dotcloud/environ-default

Added support for environment variable default value
Fix Dockerfile for new config locations

Commit 900d26221805889e617a11aa0f67ab04e5252491 should have included this.
Merge pull request #155 from MissionSt/master

Fix Dockerfile for new config locations
Require Boto v2.19.0 to work with IAM role

There is an issue with Boto v2.3.0 using IAM role to access S3.
As mentioned here (https://github.com/dotcloud/docker-registry/pull/72),
when 4 or more gunicorn worker process are trying
to fetch metadata for accessing S3, the requests are
throttled by Amazon and thus fail to launch the server.

Boto v2.10.0 and later introduces metadata_service_timeout &
metadata_service_num_attempts to resolve this issue.

This PR also comes with a Boto config file at /etc/boto.cfg to
increase default metadata timeout & attempts.
Added example apache config using HTTP basic auth.
Move boto.cfg into config/
Merge pull request #156 from xiangdao/master

Require Boto v2.19.0 to work with IAM role