Answer a question in Slack

[davidcameron]

Depends on #21

A user should be able to answer a quesion through Slack. It would look like:

"Hobz answer 123 The parameter for messge text in Slack webhooks is "text"' where "123" is the question ID.

Messages to Slack

In order to answer a question, we'll need to know the question ID, so we'll have to post a message right after a user asks a question. E.g.
"David asked 'What's the Slack webhook parameter for message text?' - #123"
"first-name' asked 'question-text' - question-id`"

Sending Answer from Slack

An answer would be typed into Slack like:
"Hobz answer 123 It's just 'text'"
"trigger-word answer message-id answer-text"

Future

Eventually we'll want to get really cute, like just having "Hobz answer ..." and having it answer the last question from that channel (presumably that means we'll have to store the channel ID the question was asked in), or "Hobz answer user-name ..." to answer the last question from that user.