Lizard hissing and lizard sprites

Fixes https://github.com/tgstation/-tg-station/issues/5866

Lizard hissing will now "look like thisss inssstead of that ssstutterwhore crap" so lizards don't look permadrunk/tased.

Lizards are no longer oblivion argonians (why) and their skin-colored horns have been removed. I don't oppose horns for lizards, but adding them to the mob sprite instead of making them a hair style is super lame and lazy.
![ss 2014-11-12 at 09 03 33](https://cloud.githubusercontent.com/assets/7247232/5023554/bbf224d2-6aaf-11e4-9fac-082c14cbee1b.png)