fix: bad user callback digestion

Prefer using $applyAsync than $apply.

Close #89

Author: douglasduteil

src/ui-ace.js

@@ -196,7 +196,7 @@ angular.module('ui.ace', [])
           var args = Array.prototype.slice.call(arguments, 1);
 
           if (angular.isDefined(callback)) {
-            scope.$apply(function () {
+            scope.$applyAsync(function () {
               if (angular.isFunction(callback)) {
                 callback(args);
               } else {

test/ace.spec.js

@@ -308,6 +308,7 @@ describe('uiAce', function () {
           scope.$apply('foo = "bar"');
           $compile('<div ui-ace="{onChange: changing}" ng-model="foo">')(scope);
           _ace.getSession().setValue('baz');
+          scope.$apply();
         }
 
         expect(compileWithObject).toThrow();