Sentry integration

[Fauntleroy]

Ultimately this is a pretty simple integration:

• We watch for any uncaughtExceptions, send them to Sentry, and exit
• We watch the default express error handler for exceptions and send them to Sentry
• We watch for non-fatal preprocessor errors and send them to Sentry, along with the context

[Fauntleroy]

As we get more uncaughtExceptions, we can determine where to handle errors more gracefully.

[pushred]

:+1: cool, let's see what we see with this out there in production