add credits.

src/math/Matrix3.js

@@ -1,6 +1,7 @@
 /**
  * @author alteredq / http://alteredqualia.com/
  * @author WestLangley / http://github.com/WestLangley
+ * @author bhouston / http://exocortex.com
  */
 
 THREE.Matrix3 = function ( n11, n12, n13, n21, n22, n23, n31, n32, n33 ) {

src/math/Matrix4.js

@@ -7,6 +7,7 @@
  * @author alteredq / http://alteredqualia.com/
  * @author mikael emtinger / http://gomo.se/
  * @author timknip / http://www.floorplanner.com/
+ * @author bhouston / http://exocortex.com
  */