Add Travis configuration file
Remove the errf and outf utility functions in favor of calling the appropriate fmt functions directly for clearer and more idiomatic code
Merge pull request #191 from tianon/travis

Add Travis configuration file
Removed utility function logf and changed cmd functions to return an error value rather than an error code.
Merge pull request #217 from Moghedrin/master

Remove the errf and outf utility functions in favor of calling fmt functions
Change a few prints to go to stderr, and avoid printing duplicate error message for the unknown command error.
Refactor main to remove unnecessary else statement
Merge pull request #219 from Moghedrin/master

Fix atypical error handling in `cmd` functions.
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