Update twit module version, remove restclient and (deprecated?) search URLs

Mark Sample reached out for help on updating his script in light of–sunsetting the search.json endpoint, I guess?

`package.json`:
- Update `twit` version
- Remove `node-restclient` dependency

`latourswag.js`:
- Remove `restclient` object
- Replace `search.json` endpoint URLs with Twit-compatible query objects
- Replace `restclient.get()` calls with `T.get()` calls