Merge pull request seiyria#38 from kou/support-angularjs-1.3-and-bootstrap-slider-4.0

Support AngularJS 1.3 and bootstrap-slider 4.0

Author: seiyria

slider.js

@@ -22,27 +22,14 @@ angular.module('ui.bootstrap-slider', [])
                 initSlider();
 
                 function initSlider() {
-
-                    if (attrs.ngChange) {
-                        ngModelCtrl.$viewChangeListeners.push(function () {
-                            $scope.$apply(attrs.ngChange);
-                        });
-                    }
-
-                    $.fn.slider.Constructor.prototype.disable = function () {
+                    $.fn.slider.constructor.prototype.disable = function () {
                         this.picker.off();
                     };
 
-                    $.fn.slider.Constructor.prototype.enable = function () {
+                    $.fn.slider.constructor.prototype.enable = function () {
                         this.picker.on();
                     };
 
-                    if (attrs.ngChange) {
-                        ngModelCtrl.$viewChangeListeners.push(function () {
-                            $scope.$apply(attrs.ngChange);
-                        });
-                    }
-
                     var options = {};
                     if ($scope.sliderid) options.id = $scope.sliderid;
                     if ($scope.min) options.min = parseFloat($scope.min);