Reduced default verbosity

This release reduces the default verbosity an only outputs a summary with the total number of skipped files and a benchmark of how long time it took to run the collect method. The biggest change is that the Command class now overrides the handle method. This might introduce problems for people using other Django versions than 1.4. Please submit issues if this is the case.

To get all the "skipped file x" logs back you should use:

$ python manage.py collectstatic --verbosity=2