fix(tabs): adds ui-sref/ng-href support to tabs

Closes #2344

Author: Robert Messerle

src/components/tabs/js/tabDirective.js

@@ -103,6 +103,7 @@ function MdTab () {
           scope:    scope,
           parent:   scope.$parent,
           index:    index,
+          element:  element,
           template: element.find('md-tab-body').html(),
           label:    element.find('md-tab-label').html()
         }, index);

src/components/tabs/js/tabsController.js

@@ -136,6 +136,7 @@ function MdTabsController ($scope, $element, $window, $timeout, $mdConstant, $md
   function select (index) {
     if (!locked) ctrl.focusIndex = $scope.selectedIndex = index;
     ctrl.lastClick = true;
+    ctrl.tabs[index].element.triggerHandler('click');
   }
 
   function scroll (event) {