Added "software-properties-common" to the list of packages to install (fix #101)
Tests : Updated to run tests on supported platforms (ubuntu 12.04, ubuntu  14.04, debian 6, debian 7) via vagrant boxes
Only install software-properties-common on ubuntu

the `software-properties-common` package does not exist in debian 6, so
we install it only on ubuntu
Updated test_install to run original tests on all supported platforms
typo in text error
Merge branch 'master' of https://github.com/vaz-ar/cozy-setup into vaz-ar-master
fix post install tests
add a dirty hack to ensure that pip is always properly installed
fix register test
Merge branch 'vaz-ar-master'