perf(): Remove inside onChange event

When the callback run while changing the slider takes a certain amount of time (~50 ms or more), the
 inside onChange can stall resulting in many changes lost along the way while it catches up.
Removing seems to have no visible side effects. It might be possible that this is due to
scope.() being called right before callOnChange(), so the model is updated anyway (see in
applyModel)

Author: Elias Cohenca

dist/rzslider.css

@@ -1,7 +1,7 @@
 /*! angularjs-slider - v2.4.0 - 
  (c) Rafal Zajac <[email protected]>, Valentin Hervieu <[email protected]>, Jussi Saarivirta <[email protected]>, Angelin Sirbu <[email protected]> - 
  https://github.com/angular-slider/angularjs-slider - 
- 2015-12-30 */
+ 2016-01-13 */
 rzslider {
   position: relative;
   display: inline-block;

dist/rzslider.js

@@ -1,7 +1,7 @@
 /*! angularjs-slider - v2.4.0 - 
  (c) Rafal Zajac <[email protected]>, Valentin Hervieu <[email protected]>, Jussi Saarivirta <[email protected]>, Angelin Sirbu <[email protected]> - 
  https://github.com/angular-slider/angularjs-slider - 
- 2015-12-30 */
+ 2016-01-13 */
 /*jslint unparam: true */
 /*global angular: false, console: false, define, module */
 (function(root, factory) {
@@ -812,10 +812,7 @@
        */
       callOnChange: function() {
         if (this.options.onChange) {
-          var self = this;
-          $timeout(function() {
-            self.options.onChange(self.options.id);
-          });
+          this.options.onChange(this.options.id);
         }
       },
 

dist/rzslider.min.css

@@ -816,10 +816,7 @@
        */
       callOnChange: function() {
         if (this.options.onChange) {
-          var self = this;
-          $timeout(function() {
-            self.options.onChange(self.options.id);
-          });
+          this.options.onChange(this.options.id);
         }
       },
 

dist/rzslider.min.js

@@ -520,7 +520,6 @@ describe('rzslider - ', function() {
         createSlider(sliderConf);
 
         slider.callOnChange();
-        $timeout.flush();
         sliderConf.options.onChange.calledWith('test').should.be.true;
       });