added Docker Index search API doc
First draft of new README. Feedback and contributions welcome!
Merge github.com:dotcloud/docker into registry-api-doc
added new sphinx contrib extention for better REST API docs, and changed the index search API so that it uses the new docs, as a test to make sure it works correctly
Merge pull request #500 from kencochrane/registry-api-doc

added Docker Index search API doc
Support for the new registry/index API (wip)
Implemented new version of PullRepository. Missing support for whole repository pull (= no tag specified)
Reimplemented feature: downloading all tags on a repository using docker pull. Temporarily commented out CmdPush
Changed some of the routes to reflect changes made to the API ; added HTTPClient singleton to the graph object
gofmt pass
Implemented checksum computation on image creation (necessary for new push primitive)
Reimplemented docker pull for new registry API (command is still deactivated)
Reactivated CmdPush in commands.go
Style changes in auth.Login
Fixed docker login
Fixed checksum representation
Fixed graph.Checksums()
Follow redirections when sending PUT request in PushRepository
Prepend hash method to the image checksum
Added X-Docker-Token header to initial index requests