Switch to guzzle4
Add client and attach changes to the documentation
Use default behavior to get docker host in tests, DOCKER_HOST env variable or unix:///var/run/docker.sock by default
Merge pull request #34 from joelwurtz/guzzle4

Switch to Guzzle4
Fixed travis run

There's a bug in Travis' PHP support where /etc/profile.d/phpenv.sh
is not sourced accordingly, thus making phpenv (and shims) unavaible
in the PATH
Fix travis build