Remove redundant normalize() in Vector3.html (there were two). Other
additions.

isZero actually checks the squared length against the "small epsilon".
0.0001 = 0.01² so the function will return true for a length < 0.01.

By the way if there is a good reason for a so limited accuracy it should be given here in the doc (or maybe even in the code).

Now you can browse the docs from the local system too. 

Renaming setRotationFromMatrix / setPositionFromMatrix to the recently changed getRotationFromMatrix / getPositionFromMatrix.