Adds bot.replyIntent()

[RafaelCosman]

Usage:

bot.replyIntent(message, "greeting");

Will hit http://www.chatamize.com/api/v1/intent?api_key=[your api key]&intent=greeting and will reply with the message returned. See chatamize.com to manage your messages.

As of 73374c0, intents-chatamize passes all tests with npm test.

Test
    ✓ should have a token
    ✓ should have Botkit instance

  Botkit
info: ** No persistent storage method specified! Data may be lost when process shuts down.
info: ** Setting up custom handlers for processing Slack messages
info: ** API CALL: https://slack.com/api/rtm.start
notice: ** BOT ID:  intent-wit-bot  ...attempting to connect to RTM!
    ✓ should start and then stop (1782ms)
info: ** No persistent storage method specified! Data may be lost when process shuts down.
info: ** Setting up custom handlers for processing Slack messages
info: ** API CALL: https://slack.com/api/rtm.start
    ✓ should have fail with false token (171ms)

  Log
    ✓ should use an external logging provider (177ms)


  5 passing (2s)

[anonrig]

Unnecessary console.log

[anonrig]

Will appreciate if you write a test for this function.

[RafaelCosman]

Closing this PR. Please see discussion in https://dev4slack.slack.com/messages/botkit-wit/.