add travis files

[devsnek]

this will make the eslint checks and mocha checks run for all commits and prs, but not reverts.

After commiting this, go to travis-ci.org and click the on-off switch next to this repo.

Apologies for using the web editor :)

P.S. for the future we could add a "deploy" script which pushes to the gh-pages with a minified, or possibly to cdnjs or s3 or something when we realize that ghpages isn't a good cdn (hopefully soon 😁)

P.P.S. when you merge PRs you might wanna use the merge and squash option, just to keep the commit history cleaner

[gliechtenstein]

It works! Thanks! 👍👍👍👍

[devsnek]

👍