Document the startup procedure

[phillipj]

This documents the most basic "setup" needed to get the bot up and running.

[phillipj]

Hm... Just realized the current procedure of polling the Travis API for build status also needs its own token.

[williamkapke]

I think ultimately this bot will need many tokens for many services. I'm using a .env file and https://www.npmjs.com/package/dotenv to load it.

[phillipj]

dotenv is nice. Should we still document which tokens are required and how to generate them in the readme?

[williamkapke]

I think an example .env file in the readme would do the trick:

WEBHOOK_SECRET="hush-hush"
GITHUB_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
TRAVIS_CI_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

I make use of the silent: true option so if there isn't an .env file- it doesn't do anything.

require('dotenv').load({ silent: true, path: __dirname + '/.env' })

Also, Make sure to add .env to the .gitignore so there are no accidental commits ;).

[Fishrock123]

seems good to me

[phillipj]

@williamkapke as you introduce dotenv in #8, I'll skip any of that in this PR