Demo application - Slack bot

[treeder]

Let's make a defacto demo application for IronFunctions so people can see how to organize functions, define their full applications, update endpoints, etc.

• endpoint to increment counters (messages per person?), every message in slack calls out to this endpoint - this can work on a per channel basis: https://api.slack.com/outgoing-webhooks
• endpoint to get raw data (messages for person X and or all people)
• endpoint to get data over time
• slackbot endpoint to pull data into slack

This will allow us to figure out how to define an entire app, update endpoints, etc.