Adds vibrator

Inspired by CreamyGoodness mistaking the mp3 player's morale boost for something high-powered.

How you work your tension out is left up to the player, but it's a *very* good battery-morale conversion.  (It's inferior to Marloss Bliss, if you're curious what I was using as a comparison.)

Adds fatigue on a 1:1 basis with morale, though, so you can't buzz around constantly.  (I don't think they're loud enough to merit attaching a sound, and user noise is likewise left to the player's imagination.)