Update excon
Fix Docker spec
WIP
Fix broken specs
Minor version bump
Update README accordingly
Update Docker and Docker::Connection to DOCKER_URL
Update README.md
Use the latest Excon, fixes Webmock issue
Remove the default port

Docker doesn't use a default port now anyway, so no reason to keep this
around
Remove methods from README and swap merge
Merge pull request #46 from swipely/add-unix-socket-support

Add unix socket support