Removed duplicate initialization of object variables. 
The original table-item-object isn't actually used in the
loops.

fixed typo "height of the are we want" -> "height of the area we want"

Correcting typoon line 44: "btween" --> "between"

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

small improvement in speed.

As discussed in #2975.

For those that don't trust jsperf :P