Update dependency fsouza/go-dockerclient to latest version

Disable main_test for CircleCI

cf
https://discuss.circleci.com/t/if-the-docker-socket-is-mounted-the-docker-container-fails-to-start/1872

Fixed FILE_CONTAINS instruction sample testfile

Add IS_INSTALLED test (related to #3)

circleci docker cp workaround

Enabled build on all platforms

Update README.md

Added test section in circle.yml

Add a build process for Dockramp binaries

Docker-DCO-1.1-Signed-off-by: Josh Hawn <[email protected]> (github: jlhawn)