[7.0] [ADD] 'document extract from database'

Hi, 

I propose a module developped by Julius Network Solution, I got here http://bazaar.launchpad.net/~julius-network-solutions/julius-openobject-addons/7.0/files.

I did some refactoring (flake8, Pylint, adding tests)

Coverage: 93%.

Note: Travis fails for Pylint bugs in other modules.

Thanks for your review.
Can you please rephrase and elaborate on what this module actually does? The meaning of "extract" is not clear.