It attempts to adjust the hips so that the avatar's head is at the same location & orientation as the HMD
in world space, however it's fighting with the internal c++ code that also attempts to adjust the hips as well.
The rotations from the neuron are effectively in world space and are deltas
from the default pose.
There still is an issue with the thumb, due to the missing joint from the Neuron.
The Neuron only has 3 thumb joints, not 4.
Changed euler angle compisition based on experiments in maya.
Also, the neuronAvatar.js attempts to transform the neuron input quaternions into
a pose relative to the avatar's default pose, but doesn't it doesn't work.
This makes the accessible for controller mapping and to JavaScript.
Added 'neuronAvatar.js' as an example of reading joints from the neuron and setting them
on the avatar. NOTE: the rotations are currently in the wrong coordinate frame.
