Fix onChange management

- setValue is always silent (see machineboy2045#46)
- deactivate watch when updating the options list internally
- user entered options, when removed, must be removed from the list
- tested in http://plnkr.co/edit/2352rt

dist/selectize.js

@@ -63,15 +63,16 @@ angular.module('selectize', []).value('selectizeConfig', {}).directive("selectiz
 
         if (!angular.equals(selectize.items, scope.ngModel)) {
           selectize.addOption(normalizeOptions(angular.copy(scope.ngModel)));
-          selectize.setValue(scope.ngModel);
+          selectize.setValue(scope.ngModel, true);
         }
       }
 
       var onChange = config.onChange,
-          onOptionAdd = config.onOptionAdd;
+          onOptionAdd = config.onOptionAdd,
+          onOptionRemove = config.onOptionRemove;
 
       config.onChange = function() {
-        if(scope.disableOnChange)
+        if (scope._disableOnChange)
           return;
 
         if (!angular.equals(selectize.items, scope.ngModel))
@@ -89,7 +90,8 @@ angular.module('selectize', []).value('selectizeConfig', {}).directive("selectiz
       };
 
       config.onOptionAdd = function(value, data) {
-        if( scope.options.indexOf(data) === -1 ) {
+        if (scope.options.indexOf(data) === -1) {
+          scope._disableWatchOptions = true;
           scope.options.push(data);
 
           if (onOptionAdd) {
@@ -98,6 +100,24 @@ angular.module('selectize', []).value('selectizeConfig', {}).directive("selectiz
         }
       };
 
+      config.onOptionRemove = function(value) {
+        var idx = -1;
+        for (var i = 0; i < scope.options.length; i++) {
+          if (scope.options[i][config.valueField] === value) {
+            idx = i;
+            break;
+          }
+        }
+        if (idx === -1)
+          return;
+        scope._disableWatchOptions = true;
+        scope.options.splice(idx, 1);
+
+        if (onOptionRemove) {
+          onOptionRemove.apply(this, arguments);
+        }
+      };
+
       if (scope.options) {
         // replace string options with generated options while retaining a reference to the same array
         normalizeOptions(scope.options);
@@ -111,7 +131,7 @@ angular.module('selectize', []).value('selectizeConfig', {}).directive("selectiz
       config.onInitialize = function() {
         selectize = element[0].selectize;
         addOptions(scope.options);
-        selectize.setValue(scope.ngModel);
+        selectize.setValue(scope.ngModel, true);
 
         //provides a way to access the selectize element from an
         //angular controller
@@ -120,11 +140,16 @@ angular.module('selectize', []).value('selectizeConfig', {}).directive("selectiz
         }
 
         scope.$watch('options', function() {
-          scope.disableOnChange = true;
+          if (scope._disableWatchOptions) {
+            scope._disableWatchOptions = false;
+            return;
+          }
+
+          scope._disableOnChange = true;
           selectize.clearOptions();
           addOptions(scope.options);
           selectize.setValue(scope.ngModel);
-          scope.disableOnChange = false;
+          scope._disableOnChange = false;
         }, true);
 
         scope.$watchCollection('ngModel', updateSelectize);