Merge pull request #734 from bartvde/xml-ie9

Fix XML serialize and xml_eql in IE9 (r=@ahocevar)

test/expect-0.2.0-ol3/expect.js

@@ -318,7 +318,10 @@
         }
         // test attribute namespace
         try {
-          expect(node1Attr[name].namespaceURI).to.equal(node2Attr[name].namespaceURI);
+          // we do not care about the difference between an empty string and null for namespaceURI
+          // some tests will fail in IE9 otherwise
+          // see also http://msdn.microsoft.com/en-us/library/ff460650(v=vs.85).aspx
+          expect(node1Attr[name].namespaceURI || null).to.be(node2Attr[name].namespaceURI || null);
         } catch(e) {
           errors.push('namespaceURI attribute test failed for: ' + node1.nodeName + ' | ' + e.message);
         }