Improved VertexNormalsHelper and FaceNormalsHelper
Update several math documentation pages.

Added some info regarding the quaternion object, its applications and the purpose of its functions.
Added some info regarding the box2 object and its functions.
Merge branch 'dev-helper' of git://github.com/WestLangley/three.js into dev
Updated builds.
documented geometries
fix typo
Merge branch 'dev' of https://github.com/mrdoob/three.js into drive
docs: Factor out page pathname
docs: Allow manual pages with capital letters

Fix opening 'Creating a scene' page with 'edit this page'.
refactored
added utils
Merge branch 'dev' of https://github.com/mrdoob/three.js into drive