Add the the classes SetOfZone, Zone and DrawImageView that defined zones in
 the previous FeatureApp project.
The methods that are no longer useful in our new project have been removed
(the save with XStream for instance). The attribute 'frontages' has also be
changed to 'zones' to fit the new vocabulary of the application.
Also create two zones in the CharastericsFragment to allow the tests of the
buttons that will be implemented in the future. This part of the code should
be removed in the future.
Add the functionnality of the "Selection" button.
Implement the "Define" button.
Also change some remaining "frontages" into "zones".
Implement the "Supprimer" button.
Implement the "Récapitulatif" button.
Change the color of the zones according to the color choose by the user.
Merge pull request #6 from jparty/UrbApp_CharacteristicsFragment

UrbApp characteristics fragment,
Implementation of the function from the FeatureApp project and some new feature.