create_container() sends a malformatted request when volumes==[] or
ports==[], causing error 500 "create: ExportEnv json: cannot unmarshal
array into Go value of type map"

The empty lists must be converted into a dict (or removed)

Allow copy() to accept dictionary like diff()

Fix _stream_result concatenating bytes with str

Ping fixes

Move this statement in `else` clause to make sure the try except block doesn't catch
coding errors.

Client.diff() silently convert container as a dictionary
to container['Id'] while Client.copy() does not.

This change makes copy() do the same job.

Without this option, requests returns lines as bytes on Python 3
which can't be concatenated with the str '\n' in the yield.

Fix unit tests broken by PR #151

Updates newer unit tests to use the http+unix scheme.

Support requests >=2.1.0

If attaching to stdin, set StdinOnce, as per the docker CLI.

Allow links to specified as (name, alias) tuples

Additionally this change should make moving to /v1.8 slightly less painful

Starting with requests 2.1.0 non-HTTP scheme URLs are not parsed anymore.
The net effect of this is that when using the unix socket in docker-py no
query string params are passed in the URL.  This change makes docker-py
internally use the scheme http+unix to indicate to requests that this is
still a HTTP URL and should be parsed.

Users of docker-py can still specify 'unix:' as the base_url.  The
following forms of base_url are accepted.

  http+unix://var/run/docker.sock
  unix://var/run/docker.sock
  unix:///var/run/docker.sock
  http://hostname
  tcp://hostname

fix "binds" docs: { host_dir: docker_dir }

Not the other way around.

Add entrypoint, cpu_shares and working_dir options to create_container

Merge branch 'feature/image-import' of github.com:tarnfeld/docker-py into tarnfeld-feature/image-import

Updated port function 

Default to /tcp for port definitions in create_container()

Fixes #141.
Signed-off-by: Maxime Petazzoni <max@signalfuse.com>

container_output() method for streaming the output without logs=1

Use relative imports

The previous version of `attach` didn't look like it was doing
anything useful, as it just yielded 4096-byte chunks of raw /attach
output, without doing any frame parsing.

Now `attach` is identical to `logs`, except that by default it
doesn't show historical output. `logs` is now a wrapper around
`attach` which sets `logs=True`, and its behaviour is unchanged.

Sensible url handling

This makes it very simple to get identical behaviour to the CLI:

    client = Client(os.environ.get('DOCKER_HOST'))

Configurable timeout on build(), defaults to None

This means docker-py will do the Right Thing if the base url is set
using the new `DOCKER_HOST` environment variable, for example.
(http://docs.docker.io/en/latest/commandline/cli/)

Many commands used in Dockerfiles hang for an extended period of time
without producing any output, which will result in a socket timeout.
Accordingly, it makes sense for build() to specify no timeout by
default.