Add support for docker -dns

Bumped default Docker API version used by Maestro to 1.10 and docker-py
requirement to 0.3.2 to support the DNS option moving forward.

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>
Enable swap limit support now that it's available in docker-py

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>
Add support for docker -net (fixes #41)

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