Add `dist/` directory

The `dist/` directory is added in order to allow even less experienced
users (users that may not want to deal with the build script) to get
the latest changes, namely, what is in the `master` branch, but is not
yet released.
Add badges

* Add Travis CI status icon.
  http://docs.travis-ci.com/user/status-images/

* Add `devDependencies` status icon.
  https://david-dm.org/