Added collinear,opposite,same direction function to vector3
Added extract/copy Matrix4x3 to Matrix4x4
Fixed Camera lookAt bug
Fixed collinear, perpendicular methods
Added methods to Vector2 and Vector interface
Added gwt method to extract 4x3 matrix
Added isZero function to MathUtils
Fix to Vector3 methods
Fix to getScale function Matrix4
Merge pull request #1342 from lordjone/test

Math and Camera