Add Developer Certificate of Origin Text

We purposely chose to license Docker under the Apache 2.0 license. This is a well-known
license, which is popular for its permissive and flexible properties, while still
encouraging a collaborative community. It also makes certain representations with regard
to contributions, and the rights given to contributors, the project, people who use Docker,
people who modify Docker, etc.

This approach to contributions is inspired by the popular Linux Developer
"Certificate of Origin". This approach makes it simple for new contributors to get started,
and avoids bureaucracy in tracking contributions and contributors.

To indicate accordance, each individual contribution to the Project is signed off by the
developer, using his or her real name, email address, and github handle in the format below:

	Docker-DCO-1.0-Signed-off-by: Joe Smith <joe.smith@email.com>
Increase max image depth to 127
Merged with master
added authConfig to docker build
Engine: new command 'kill' sends a signal to a running container
Hack: use new 'kill' command in integration tests
gofmt
Engine: port 'kill' to the new integer status.
New engine command: 'wait'
Engine: don't log job stdout to engine stdout (it might be non-text output, for example tar data for 'export'
Engine: 'export' returns a raw archive of a container's filesystem
Hack: stats.sh prints useful project stats for maintainers
Engine: break out Env utilities into their own type - Env
Engine: Output.AddEnv decodes structured data from the standard output of a job
Engine: convenience http transport for simple remote job execution
Cleanup version introspection

* Unify version checking code into version.go
* Make 'version' available as a job in the engine
* Use simplified version checking code when setting user agent for registry client.
Port 'docker version' to the engine API
Merge pull request #3117 from shykes/engine-refactor-env

Engine: break out Env utilities into their own type - Env
Merge pull request #3118 from shykes/engine-structured-output

Engine: jobs can send structured output as json on stdout
archlinux installation doc: correct some details

1. The AUR package is called docker-git, not lxc-docker-git.

2. According to the official community package, docker depends on
   sqlite.

3. 02ef8ec (Update archlinux.rst as packages have changed, 2013-12-06)
   updated the installation instructions, but left behind residual
   wording about the AUR package not being officially supported; the
   community repository is officially supported.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>