Don't auto open the last conversation. It doesn't make sense now that we
no longer have two column layout.
Don't trigger/listen for selected events. There's no need since the list
item opens a new popup now.
Just display a sensible default in the frontend if it's unset.
For private conversations this should be the phone number, for
groups, the list of numbers.
This dependency may be a little heavy for our current use case, but we can
roll with it for now and find something slimmer if it turns out yagni.
Closes#77Closes#40
Each conversation views now manages its own separate elements
rather than all binding to a shared #conversation element, and
similarly for message composition ui.
Also includes the beginnings of group creation UI (not working yet),
featuring bootstrap-tagsinput field for entering group recipients
Let ConversationListItemView save a reference to its corresponding
ConversationView. This lets it render or delegate/undelegate events
when opening and closing a conversation.
Similarly for ConversationView itself, which contains a MessageListView.
