Added features

The first lines of the file must be:
```
# -*- coding: utf-8 -*-
'''
Copyright (C) 2012-2014  Diego Torres Milano
Created on Feb 2, 2012

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

@author: <list of authors>
```