Update mapping.js

- Add new mapping.
@horse_js https://twitter.com/horse_js/status/496154962133786624
@mikewest https://twitter.com/mikewest/status/495988209818419202

- Replace double quotes with single quote.

- Replace `/statuses/` with `/status/` in the tweet URL.
Merge pull request #3 from pablodenadai/patch-2

Update mapping.js