Production config for Heroku

[jlev]

Hey folks, there were a few changes needed to get this building on Heroku. Also compressed the bundle significantly, ensured it would be able to cache properly, and fixed an issue with server-side redirects.

[lupitadavila]

the linter is blocking the tests, can you look into to them? @jlev not sure what your thoughts are on the linter rules that are set up right now

[jlev]

Hi Lupita, thanks for the reminder. I hadn't set up the linter to run on my git commits, so I hadn't seen this failing on Travis. I pushed the fixes recommended by eslint, and made a minor change to the rc to allow for plusplus when in for-loops.

I'm not a modern javascript expert, so I don't yet default to fat arrow syntax, but the linting rules seem fine to me and are a good reminder on a big shared project. There are a lot of warnings about console statements, which should probably be handled by a logging system going forward.

[lupitadavila]

@perfectlynormalbeast I'm not sure why the checks aren't syncing with this PR, do you have any idea? I reran the build and it passed https://travis-ci.org/Twilio-org/phonebank/jobs/282995539

[JadziaHax]

@jlev you might want to try another push to this branch.