Cereate a new registry object for each request (~session)
Update tests with new cookies for registry
Removed debug output in 'docker version'
Merge pull request #739 from dotcloud/push_issue-1

- Registry: Cereate a new registry object for each request (~session)
Merge branch 'master' of ssh://github.com/dotcloud/docker
always display help in the same order
Merge pull request #750 from dotcloud/ensure_order_help-fix

Always display help in the same order
ensure progress downloader is well formated