GSoC Week 11

[Luciano Prestes <lucianopcbr@gmail.com>]

What was done
=============

Refactor and apply revision changes on script to generates clusters with
popularity-contest data

Makes AppRecommender run when user install a new package with apt, and update
the packages on xapian when user runs 'apt-get update'


To the next week
================

- Send patch to popularity-contest
- Integrates the collaborative strategy on AppRecommender