Include updates to test.js to make its output more useful as a diagnostic.
It remains a future TODO to do integration testing with the real letsencrypt
client.
Also, work around a go vet bug.
Nut, https://github.com/jingweno/nut, is a tool to manage Go dependencies and
versioning by vendorizing them, i.e. including them in your own repo.
This makes version management easier, as well as authenticating the contents of
this repository.
Also inthis change: Factor out the testing commands from .travis.yml to make it
easier to run them by hand. Add Vim swap files to .gitignore.
Jacob Hoffman-Andrews