Make end users not need to make a matrix or quaternion

[davepagurek]

The features I think we need to provide to enable this:

// Scaling an arbitrary amount around a point, or the origin if none are held
bone.hold(bone.point('base')).scale(1.5).release();

// Rotating an arbitrary amount around an axis
bone.hold(bone.point('base')).hold(bone.point('tip')).rotate(180).release();

// Rotate a random amount about a point
bone.hold(bone.point('base')).randomlyRotate().release();

// Rotate a random amount about a point, but keeping another point facing up
// (basically, rotate randomly in a hemisphere where up-hold is the normal.)
// If you have a better name for this sort of rotation, let me know, because this
// is still confusing
bone.hold(bone.point('base')).randomlyRotate({up: bone.point('tip')}).release();

[armcburney]

Do we want this for the midterm demo? If so, I can grab it.

[davepagurek]

Going to address the randomness ones separately here: #52