Gave ghosts their own emote proc, added colorful text to distinguish emotes made by ghosts.

* Added /mob/dead/observer/emote()
* Added a proc to be called whenever a ghost emotes something
* Added emote_dead, which displays the *fancy* emote text to admins, mods, and those with M.stat DEAD

![emote_dead](https://f.cloud.github.com/assets/1355638/866339/eea1e950-f669-11e2-9beb-b040855246b1.png)