Use a bound texture for the iris, load it with Qt rather than lodepng (we can
probably just remove the lodepng dependency).
Added per-pixel specular highlight to irises.
Merge pull request #536 from ey6es/master

Use a bound texture for iris, added per-pixel specular highlight on it.
Merge branch 'master' of https://github.com/worklist/hifi
fixes per review