Fix a typo.
Merge pull request #33 from nubs/patch-1

Fix a typo.
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
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
Fix travis build