Support for threaded messages

[brentm5]

It seems that slack released support for threads today. I assume this would require some updates to how messages are sent (as it requires a thread_ts attribute now). This would be cool to allow lita to work with threads.

https://slackhq.com/threaded-messaging-comes-to-slack-417ffba054bd#.7pnrkzw4y

https://medium.com/slack-developer-blog/bringing-your-bot-into-threaded-messages-cd272a42924f#.nzmqemc49

[nwesoccer]

+1

Would be awesome for lita to respond to threaded messages on the thread. Would also be cool if lita could respond to channel messages by starting the thread off the message.

[ghost]

I have implemented this in my company's fork of lita-slack. It's a messy prototype just now, but it's been working well for us. Details here:
#123

[spkane]

This fork has solid support for threading https://github.com/Shopify/lita-slack