Refactored multiple section ot the about.py code:
 * FIELDS lists are now tuples
 * Several method renamed
 * Simplified and improved the AboutCollector class, now iterable
 * Added tests
Fixed test on Python2.6
Refactored the relative path transformation as its own method, more refactoring needed.
Replaced print() statements by proper logging for verbosity related information.
Provided better api to encapsulate all the about instances errors and warnings on the AboutCollector.
Moved the print() statement in the command line code
Merge branch 'refactoring' into develop