Mzk/sandbox points integration

[mzkrasner]

Accounts for integration of Points into Sandbox:

1. New above-the-fold module that displays points data for the individual (if logged in)
2. New browser event listening instead of polling, both for developer feed and points
3. Use of express server endpoint (digital ocean) to issue and read points via fetch requests

[JustinaPetr]

Really cool! Everything worked for me. I think for the fast iteration purposes we can go ahead and merge. Some suggestions for some tweaks after we merge:

• It could be worth to add a link to the points library somewhere. Stating something like "Curious to see how the points were implemented? Head here."
• It would be cool if would have the points counter visible at each step of the tutorial. After seeing it only once at the beginning of the page it's easy to forget that we get points for performing all of these tasks.