Better iris texture.
Merge branch 'master' of https://github.com/worklist/hifi
Fix iris orientations: start with the head orientation, then rotate onto the
lookat vector.  This way, the irises don't rotate around as we yaw.
Shed some light on what these shaders are doing, so to speak.
Ryan's new iris texture.
Added refraction to irises.
Merge pull request #539 from ey6es/master

Better iris texture, fixed iris rotations.