Merge pull request #218 from SvenDowideit/get-client-certs

Get client certs from vm, and set up the DOCKER_HOST with the real connection string
Expand the github error message - and show the JSON payload if even that fails
Merge pull request #220 from SvenDowideit/show-github-error-details

Expand the github error message - and show the JSON payload if even that...
add a minimal 'raw' driver to talk to my old non-vm systems