[[FIX]] Add missing globals to browser environment

DOM4 defines the constructors for these interfaces:

- Comment
- DocumentFragment
- Range
- Text

Add them to the "browser" environment.

Source: http://www.w3.org/TR/2014/WD-dom-20140710/

src/vars.js

@@ -76,11 +76,13 @@ exports.browser = {
   clearTimeout         : false,
   close                : false,
   closed               : false,
+  Comment              : false,
   CustomEvent          : false,
   DOMParser            : false,
   defaultStatus        : false,
   Document             : false,
   document             : false,
+  DocumentFragment     : false,
   Element              : false,
   ElementTimeControl   : false,
   Event                : false,
@@ -176,6 +178,7 @@ exports.browser = {
   Option               : false,
   parent               : false,
   print                : false,
+  Range                : false,
   requestAnimationFrame : false,
   removeEventListener  : false,
   resizeBy             : false,
@@ -344,6 +347,7 @@ exports.browser = {
   SVGViewElement       : false,
   SVGViewSpec          : false,
   SVGZoomAndPan        : false,
+  Text                 : false,
   TextDecoder          : false,
   TextEncoder          : false,
   TimeEvent            : false,

tests/unit/fixtures/browser.js

@@ -19,3 +19,9 @@ var mutationObserver = new MutationObserver(/* callback */);
 
 // SVGElement
 var svgProto = SVGElement.prototype;
+
+// DOM4 Constructors
+var comment = new Comment("");
+var df = new DocumentFragment();
+var range = new Range();
+var text = new Text("");

tests/unit/options.js

@@ -1439,6 +1439,10 @@ exports.browser = function (test) {
     .addError(15, "'Node' is not defined.")
     .addError(18, "'MutationObserver' is not defined.")
     .addError(21, "'SVGElement' is not defined.")
+    .addError(24, "'Comment' is not defined.")
+    .addError(25, "'DocumentFragment' is not defined.")
+    .addError(26, "'Range' is not defined.")
+    .addError(27, "'Text' is not defined.")
     .test(src, {es3: true, undef: true });
 
   TestRun(test).test(src, {es3: true, browser: true, undef: true });