move bot.js to main.js
Fix JSON comment.
JSON.parse doesn't like comments, so update userMap to indicate that,
and that it should be changed.
Move slack into its own module.
Add slack-outgoing-webhook listener.
Add outgoing webhook token to config.
Check outgoing web token.
Fix missing outgoing webhook function.
Fix outgoing hooks, add ping handler.
Add 'say' command from slack.
Fix slack echo for !say, and message formatting.
Suppor for !show.

Boilerplate for !link and !unlink.