Add Everything Map API call

[c17a]

Update API definotion document to support Citymapper's everything map api call.

Here's a sample url:

https://www1.citymapper.com/api/1/everythingmap?callback=jQuery21402746502801310271_1454437833175&location=51.55111161851035%2C0.28035942785641055&size=large&region_id=uk-london&_=1454437833176