feat(jqLite): add prop() support

since jQuery 1.6.4 prop() became very important because attr() does't have access to certain properties any more (e.g. className), so I'm adding it to jqLite as well so that jqLite preserves the feature-set it had before the jQuery upgrade.

src/jqLite.js

@@ -40,6 +40,7 @@
  * - [eq()](http://api.jquery.com/eq/)
  * - [hasClass()](http://api.jquery.com/hasClass/)
  * - [parent()](http://api.jquery.com/parent/)
+ * - [prop()](http://api.jquery.com/prop/)
  * - [remove()](http://api.jquery.com/remove/)
  * - [removeAttr()](http://api.jquery.com/removeAttr/)
  * - [removeClass()](http://api.jquery.com/removeClass/)
@@ -287,6 +288,14 @@ forEach({
     }
   },
 
+  prop: function(element, name, value) {
+    if (isDefined(value)) {
+      element[name] = value;
+    } else {
+      return element[name];
+    }
+  },
+
   text: extend((msie < 9)
       ? function(element, value) {
         // NodeType == 3 is text node

test/jqLiteSpec.js

@@ -171,6 +171,38 @@ describe('jqLite', function(){
   });
 
 
+  describe('prop', function() {
+    it('should read element property', function() {
+      var elm = jqLite('<div class="foo">a</div>');
+      expect(elm.prop('className')).toBe('foo');
+    });
+
+    it('should set element property to a value', function() {
+      var elm = jqLite('<div class="foo">a</div>');
+      elm.prop('className', 'bar');
+      expect(elm[0].className).toBe('bar');
+      expect(elm.prop('className')).toBe('bar');
+    });
+
+    it('should set boolean element property', function() {
+      var elm = jqLite('<input type="checkbox">');
+      expect(elm.prop('checked')).toBe(false);
+
+      elm.prop('checked', true);
+      expect(elm.prop('checked')).toBe(true);
+
+      elm.prop('checked', '');
+      expect(elm.prop('checked')).toBe(false);
+
+      elm.prop('checked', 'lala');
+      expect(elm.prop('checked')).toBe(true);
+
+      elm.prop('checked', null);
+      expect(elm.prop('checked')).toBe(false);
+    });
+  });
+
+
   describe('class', function(){
 
     describe('hasClass', function(){