Travis Setup for showing json status on Pull Requests

Currently, you have to manually review PRs unlike the API because while the API can reject invalid JSON, PRs have to be manually merged by you. So I made this travis integration to help you merge PRs.

Once you merge it to master, go to travis, sign in, and add your MIT-licence repo using the plus button. Any PRs that you receive after that will have a green/red status attached. 

I know this is a PHP project, but I found npm test to be easier to setup than phpunit, which would have required a bit more configuration. I've also removed three invalid JSON files that were not being properly rendered anyway on the website.

You can browse the repo on travis to see various build statuses [here](https://travis-ci.org/captn3m0/mit-license/). A sample PR (intentionally failing) is [here](https://github.com/captn3m0/mit-license/pull/1)

Reply if you have any issues setting it up.