GSoC Week 12

[Luciano Prestes <lucianopcbr@gmail.com>]

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

  Fix apt hook to run recommendations when the user install a package with apt

  Fix AppRecommender base_dir, and add a script "run_from_source" to run AppRecommender on development mode.

  Use only the apt.Cache packages that are indexed on xapian

  Popularity-contest cluster script creates a version control to the output data

  AppRecommender makes the download of the cluster data and checks the popcon signature and checksum

  Remove patchs of AppRecommender package