Mimic official giphy slack bot message formatting

[patsissons]

we can use the customMessage function in the slack adapater: https://github.com/slackhq/hubot-slack/blob/596c4181ccb9f8423c15077e3df2e960cd9981eb/src/slack.coffee#L286

Some more info on it at these links:

• https://api.slack.com/docs/formatting
• https://api.slack.com/docs/attachments
• https://api.slack.com/methods/chat.postMessage
• https://github.com/slackhq/hubot-slack/issues/170#issuecomment-113315455
• https://github.com/slackhq/hubot-slack/issues/43#issuecomment-143563536

[patsissons]

should probably allow this to be disabled via an env var.

[patsissons]

consider using for the thumb_url

might need to crop it into a square.

source:

• https://media2.giphy.com/labs/images/giphbot-hubot-plugin.gif
• http://giphy.com/labs/

[patsissons]

test this format at https://api.slack.com/methods/chat.postMessage/test with: "attachments": [{"text": "<http://giphy.com/labs/|Giphy Labs> (123KB)", "image_url": "http://giphy.com/static/img/labs.gif"}]

visualize in the message builder

[patsissons]

we can confirm using the hubot-slack adapter by checking that robot.adapterName == 'slack'