removed exception thrown if registry.hub.docker.com is explicitly defined in repository param for client.pull

0.7.0 release

adding the ability to login with different dockercfg files.

flake8 fails with F821 for unicode under python 3.4.2

Tidy up stream test harness & fix race conditions

Conflicts:
	tests/test.py

Support for host config

* Warnings will now raise exceptions in unit tests
* Updated several tests to use host_config

* Deprecation warnings added in Client.start

Devices should be separated by colon separated string

Run Travis tests on Docker

Signed-off-by: Ben Firshman <ben@firshman.co.uk>

Totally bad test :( (written by me). The documentation and
code should match now. Many thanks to pranavs18 for spotting
the error and proposing the fix.