Land rapid7#3174, @wchen-r7's object detection for ie11

Author: jvazquez-r7

data/js/detect/os.js

@@ -945,11 +945,18 @@ window.os_detect.getVersion = function(){
 		if (!ua_version) {
 			// The ScriptEngine functions failed us, try some object detection
 			if (document.documentElement && (typeof document.documentElement.style.maxHeight)!="undefined") {
-				// IE 10 detection using nodeName
+				// IE 11 detection, see: http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx
 				try {
-					var badNode = document.createElement && document.createElement("badname");
-					if (badNode && badNode.nodeName === "BADNAME") { ua_version = "10.0"; }
-				} catch(e) {}
+					if (document.__proto__ != undefined) { ua_version = "11.0"; }
+				} catch (e) {}
+
+				// IE 10 detection using nodeName
+				if (!ua_version) {
+					try {
+						var badNode = document.createElement && document.createElement("badname");
+						if (badNode && badNode.nodeName === "BADNAME") { ua_version = "10.0"; }
+					} catch(e) {}
+				}
 
 				// IE 9 detection based on a "Object doesn't support property or method" error
 				if (!ua_version) {