Updates Hair Sprites

The old sprites were simply inverted, meaning what was supposed to be the highlights showed up as shadows, and vice-versa. What I've done here is simply un-inverted it and fiddled with the levels to improve their visual quality and steer away from looking like solid blobs of color.

![hairtest2](https://f.cloud.github.com/assets/3828067/2432163/098ffa00-ad57-11e3-8168-a12ecb37bde1.png)