Revise gemspec for Lita 4/Slack RTM.
Add Travis config file.
Add locale file.
Use Lita 4 configuration system.
Use new config format in README example.
Use Lita 4 configuration system.
wip
Update faye-websocket to 0.8.0.
Extract REST API logic to a class.
Simplify #send_messages.
Extract user creation to a class.
Extract message handling into a class.
Refactor message handler.
Log any errors received from Slack.
Don't require the subtype property in a message.
Get user's real name from "profile" hash.
Store user to IM mapping and extract API responses into structs.
Limit outgoing message size.
Rename ws to websocket.
Rename create_im(s) to add_mapping(s).