minor changes
setting repo directory in the constructor of FileRetrieval
sleep(1) is added to the test
htmlentities() are inserted into proper place
1. a page that does not contain any ad is now removed from the repository (if previously it ws saved).
2. to avoid passing large amount of data between methods, it is added filtering out ads that do not contain keywords at the level of classes (for the moment, for Portaportese one).
conflicts are resolved