Fix eyePosition so that lookatVectors point directly to eyes,
even when looking at someone from above.
LookatIndicator now scales with the avatar's scale.
Replace var in renderLookatIndicator with const IDENTITY_UP
Merge pull request #720 from LionTurtle/master

Fix eyePosition so that lookatVectors point directly to eyes,
Merge branch 'master' of https://github.com/worklist/hifi into unlimited_avatars