For contributing in this project, you need to create a pull request containing both your code and tests.
To create a proper patch I suggest:
$ npm install -g gulp testem
$ gulp
And in another terminal / tab:
$ testem -f config/testem.json
Then you can see if you have your new tests passing.
Please, don't include the files at /dist. They can sometimes conflict and it is better that I generate then by hand after merging your PR.