Update to python27

Hi, I've updated to python27 of appengine and I replaced the scrapper with [rae](https://pypi.python.org/pypi/rae).

You can see an example here:

* http://drae-bot.appspot.com/json?query=perro
* http://drae-bot.appspot.com/xml?query=perro

P.D. I haven't done the handler for REST. I'll try to update soon.

Greetings.