Updated documentation

(And added missing change from previous commit!)

src/Layout.js

@@ -985,22 +985,3 @@ var computeLayout = (function() {
     extractNodes: extractNodes
   };
 })();
-
-// UMD (Universal Module Definition)
-// See https://github.com/umdjs/umd for reference
-(function (root, factory) {
-  if (typeof define === 'function' && define.amd) {
-    // AMD. Register as an anonymous module.
-    define([], factory);
-  } else if (typeof exports === 'object') {
-    // Node. Does not work with strict CommonJS, but
-    // only CommonJS-like environments that support module.exports,
-    // like Node.
-    module.exports = factory();
-  } else {
-    // Browser globals (root is window)
-    root.returnExports = factory();
-  }
-}(this, function () {
-  return computeLayout;
-}));