Allow to turn off instrumentation via settings.py

So that one could instrument one django app,
and view results on another.
Added time and count aggregation.
Better time precision.
Deeper instrumentation.
Views/requests profiling.
Update setup.py

Added the argparse requirement.
Merge commit '91bb3e063694aa05b5c05b34291789a476fa3dec'

* commit '91bb3e063694aa05b5c05b34291789a476fa3dec':
  Update setup.py