DataProcessorServer

I create a server managing script `bin/server.py` (#30)
and server/cgi-bin/api.cgi (#31).

The server starts
```shell
./bin/server.py start 8080 server/
```
the first argument is the port of server,
and the second is the root directory for server.
The command
```shell
./bin/server.py stop
```
kill the server.

Please test it :)


I next create webapp.
I need a function to get widget HTML:

```python
html_part = get_widget_html("/path/to/data")
print(html_part)
```
```html
<section>
    <table>
    ...
    </table>
</section>
```
I want to hear the ideas of @marubu