Fix on "ckeditor-track-changes" plugin

plugin.js

// Line: 103
        ed.on("destroy", (function(editor) {
            var ind = this._findPluginIndex(editor);
            var ind = _findPluginIndex(editor.editor);
                if (ind >= 0) {
                    if (_pluginMap[ind].plugin._tracker) {
                        _pluginMap[ind].plugin._tracker.stopTracking(true);
                        jQuery(_pluginMap[ind].plugin._tracker).unbind();
                        _pluginMap[ind].plugin._tracker = null;
                    }
                    _pluginMap.splice(ind, 1);
                }
        }).bind(this));
//
//
//
// Line: 715

    _onSelectionChanged : function(event) {
        // console.log("selection changed event"); // comment this to have a cleaner console. and avoid possible errors