Adding OnCue Snippet for user feedback (WIP)

This adds a modal popup on page load via a javascript snippet from OnCue.

It links out to https://docs.google.com/spreadsheet/viewform?formkey=dFEzOHNZaFpjczhzeHZYMS1QYkZGNFE6MA

- [ ] This should only pop up for Rackers and only when a user tries leaving a page.