fix(tests): remove invalid use of css private names

Author: ThomasBurleson

src/components/menuBar/menu-bar.spec.js

@@ -79,7 +79,7 @@ describe('material.components.menuBar', function() {
 
         function getOpenSubMenu() {
           debugger;
-          var containers = document.body.querySelectorAll('._md-open-menu-container._md-active');
+          var containers = document.body.querySelectorAll('.md-open-menu-container.md-active');
           var lastContainer = containers.item(containers.length - 1);
 
           return angular.element(lastContainer.querySelector('md-menu-content'));

src/core/util/util.js

@@ -642,6 +642,19 @@ function UtilFactory($document, $timeout, $compile, $rootScope, $$mdAnimate, $in
       return current;
     },
 
+    /**
+       * Parses an attribute value, mostly a string.
+       * By default checks for negated values and returns `false´ if present.
+       * Negated values are: (native falsy) and negative strings like:
+       * `false` or `0`.
+       * @param value Attribute value which should be parsed.
+       * @param negatedCheck When set to false, won't check for negated values.
+       * @returns {boolean}
+       */
+      parseAttributeBoolean: function(value, negatedCheck) {
+        return value === '' || !!value && (negatedCheck === false || value !== 'false' && value !== '0');
+      },
+
     hasComputedStyle: hasComputedStyle
   };