ConversationActivity: Add InputMethodManager -> close when leaving the view (since we forced it earlier) and implement Tab-Complete on the input bar.
Fix bug #17

This fixes ZNC's habit of destroying channels while we're still connecting *and* a bug involving ZNC and auto-send commands.

Auto-send commands were sent whenever the server sent a response for [registered] -- This would throw you into an infinite loop when using the ZNC jumpNetwork command, as ZNC sends extraneous [registered] responses.