copy the client certs to the local system on 'docker up'
- report the actual Docker port in use
- add 'docker socket' command that can be used in scripts
use a subdir to put the b2d certs into so we're less likely to annoy advanced users
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