Issue #5: Fixed.

Multiprocessing added using the multiprocessing.Process files. The system now tries to execute all the request for a given user at once so as to obtain the results sooner.

Some minor changes where also added regarding the way in which the results dictionaries is used. Right now, the key for this dictionary is not the str(<Platform>) but the <Platform> object itself. This allows the developer to perform additional operations such as, for example, calculating the exposure depending on the tags of the platforms.