Remove unnecessary commented code from Conversation
Remove unnecessary commented code from Conversation

This code was used before generalizing the models. It is no longer necessary, though it may serve as inspiration for adding more convenience methods to Conversation.

watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,tad-iizuka/swift-sdk