Maintenance: Refactored MUD_Buffer to MUDBuffer and updated UML diagram.

The yUML website doesn't seem to be able to draw the diagram anymore.  It gets close if you delete the last three arrows.
Maintenance: Deleted a lot of commented code and did a lot of cleanup on BotThread and MudReaderThread.

Commented code was the old flag method of killing combat threads, and there was some cleanup of the bot thread aura stuff.  There was a minor bug where things wouldn't be done properly at 0 mana.  It's all minor, including heal_up() and engage_any_attacking_mobs().
Maintenance: Cleanup of CommandHandler with improvement to 'flee' method.

If there's time for one more attack before the cast timer completes, now the flee algorithm will do that attack.
Maintenance: Comments cleanup, especially comments pertaining to planning out BotReactions.
Python 3.4 Fixes