jqLite should recognize window as an element even in IE

in IE window object has length property which makes it look like a
collection to jqLite. This commit makes jqLite properly identify
window as an element even in IE.

IE6 doesn't have Window type, so we need to check against window
object and only then do a more general check against Window. This
is not perfect, but I say screw IE6.

src/Angular.js

@@ -400,6 +400,17 @@ function isArray(value) { return value instanceof Array; }
 function isFunction(value){ return typeof value == $function;}
 
 
+/**
+ * Checks if `obj` is a window object.
+ *
+ * @private
+ * @param {*} obj Object to check
+ * @returns {boolean} True if `obj` is a window obj.
+ */
+function isWindow(obj) {
+  return obj && obj.document && obj.location && obj.alert && obj.setInterval;
+}
+
 function isBoolean(value) { return typeof value == $boolean;}
 function isTextNode(node) { return nodeName_(node) == '#text'; }
 function trim(value) { return isString(value) ? value.replace(/^\s*/, '').replace(/\s*$/, '') : value; }

src/jqLite.js

@@ -47,7 +47,7 @@ function getStyle(element) {
 }
 
 function JQLite(element) {
-  if (!isElement(element) && isDefined(element.length) && element.item) {
+  if (!isElement(element) && isDefined(element.length) && element.item && !isWindow(element)) {
     for(var i=0; i < element.length; i++) {
       this[i] = element[i];
     }