Renamed management commands to have a namespace.

This seems cleaner overall and allows the common names such as
"import_catalogue" to be defined by your application.

oscar/management/commands/calculate_scores.py → oscar/management/commands/oscar_calculate_scores.py

 from oscar.core.loading import import_module
 import_module('analytics.utils', ['ScoreCalculator'], locals())
 
+logger = logging.getLogger(__name__)
+
 
 class Command(BaseCommand):
-    
     help = 'Calculate product scores based on analytics data'
     
     def handle(self, *args, **options):
-        
-        logger = logging.getLogger(__name__)
-        calculator = ScoreCalculator(logger)
-        calculator.run()
+        ScoreCalculator(logger).run()