fix(js/onresize): make sync call async in angular

Wrap sync callback for the resize event in a `$timeout` so that it
gets called asyncronously. Fixes error where `$apply` was geting
called before previous `$apply` call finished. Angular allows only
one `$apply` call at a time.

See Angular.js reference.
> [Error: $rootScope:inprog](https://docs.angularjs.org/error/$rootScope/inprog)

Fixes:

> *Error* ldn/angular in O/<
> error[$rootScope:inprog] http://errors.angularjs.org/1.5.3/$rootScope/inprog?p0=%24digest

Likely fixes other errors we're seeing related to resize events
such as

> *ReferenceError<unknown module>* in onresize
> Can't find variable: tree

static/js/directives/onresize.js

@@ -1,14 +1,18 @@
 /**
- * Adds an onresize event attribtue that gets invokved when the size of the window changes.
+ * Adds an onresize event attribute that gets invokved when the size of the window changes.
  */
-angular.module('quay').directive('onresize', function ($window, $parse) {
+angular.module('quay').directive('onresize', function ($window, $parse, $timeout) {
   return function (scope, element, attr) {
     var fn = $parse(attr.onresize);
 
     var notifyResized = function() {
-      scope.$apply(function () {
+      // Angular.js enforces only one call to $apply can run at a time.
+      // Use $timeout to make the scope update safe, even when called within another $apply block,
+      // by scheduling it on the call stack.
+      // See docs: https://docs.angularjs.org/error/$rootScope/inprog
+      $timeout(function () {
         fn(scope);
-      });
+      }, 0);
     };
 
     angular.element($window).on('resize', null, notifyResized);
@@ -17,4 +21,4 @@ angular.module('quay').directive('onresize', function ($window, $parse) {
       angular.element($window).off('resize', null, notifyResized);
     });
   };
-});
+});