Add support for .dockerignore

Fixes #265.

Implementation is a bit more elaborate than docker's implementation and
matches with the one proposed in dotcloud/docker#6869 to handle permission
issues more nicely.

Release 0.4.0

Add documentation format of environment variable

This fixes #277

Add coverage

Support for TLS auth

Conflicts:
	docker/client.py

Improved TLSConfig API

Support same URL schemes as Docker

fix remote testing

to run the tests on a host without using the default unix socket, it's
now possible to specify:

    DOCKER_HOST=tcp://localdocker:4243 env/bin/python setup.py test

fix ssl_version exception when urllib3 version <= 1.5

TestWithBinds was failing when shared folders are used because /tmp was
not shared from OS X to my VM. This fix allows the location of the temp
folders to be changed via:

    TMPDIR=$(pwd) env/bin/python setup.py test

This also properly cleans up temp folders which were sticking around
before.

Implemented complete parse_host method to handle all accepted values of Client's base_url. Unit tests

Simple TLS configuration doesn't create the ssl_version attribute, use default when mounting adapter

0.3.2 release

* Exported TLS configuration in tls.TLSConfig
* Merged exceptions packagee into pre-existing errors module
* Flake8 fixes
* Bug fixes