Docker

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* Improvements to the `tox.ini` file

Bugfixes

* Fixed a bug where the package would fail with an `ImportError` if requests
was installed using `apt-get`
* Fixed a bug where `Client.build` would fail if given a `path` parameter.
* Fixed several bugs in `Client.login`. It should now work with API versions
1.4, 1.5.
* Please note that `Client.login` currently doesn't write auth to the
`.dockercfg` file, thus **auth is not persistent when using this method.**

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* **This version introduces breaking changes!**
* `Client.kill`, `Client.remove_container`, `Client.remove_image`,
`Client.restart`, `Client.start`, `Client.stop` and `Client.wait` don't support
varargs anymore.
* Added commands `Client.top` and `Client.copy`
* Added `lxc_conf` parameter to `Client.start`
* Added support for authentication in `Client.pull` (API version >=1.5)
* Added support for privileged containers.
* Error management overhaul. The new version should be more consistent and
* All methods that expected a container ID as argument now also support a dict
containing an `Id` key.
* Added license header to python files.
* Several `README.md` updates.

Bugfixes

* Fixed several bugs with auth config parsing.
* Fixed a bug in `Client.push` where it would raise an exception if
the auth config wasn't loaded.
* Fixed a bug in `Client.pull` where private registry images wouldn't be parsed
properly if it contained port information.

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* `Client.build` now uses tempfiles to store build context instead of storing
it in memory
* Added `nocache` option to `Client.build`
* `Client.remove_container` now raises an exception when trying to remove a
running container
* `Client.create_container` now accepts dicts for the `environment` parameter

Bugfixes

* Fixed a bug in `Client.create_container` on Python 2.6 where unicode
commands would fail to be parsed
* Fixed a bug in `Client.build` where the `tag` parameter would not be taken
into account

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* Added support for API connection through UNIX socket (default for docker 0.5.2+)

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* The client now tries to load the auth config from `~/.dockercfg`. This is necessary to use the push command if API version is >1.0

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* Added a `quiet parameter` to `Client.build` (mirrors the `q` parameter in the API)