Make the conversation list control opening of the conversation window, rather than the conversation object
Remove unnecessary send of peerPresence to the conversation window in talkilla.conversation-open
No need to for handleIncomingOffer to return true and false, and route all messages via _sendMessage
Fix review comments - improve documentation and code readabilty
Merge pull request #394 from Standard8/conversation_improve

Improve the conversation object - reduce items it depends on and that are passed to it