implemented Box3.transform, tested.  Removed Box3/Box3.scale as it doesn't work in the general case.  move tests to tests/math from tests/core to replace move of tested source files.

Patch 6

This seems to be working so, I'm going to leave it like this

removing question marks and uppercase title.

This will allow new github users to see this document when they open a new issue??

For the moment just continuing with having both vertex and fragment shaders using the same precision (not to get uniforms precision mismatch, see #1602).

See #2769

adopt @mrdoob's suggested Box2,Box3 constructor (update tests), make Triangle.normal also available as a static (easy consistent normal generation.)