Add docs for adding new deps with peep.
Update dennis to 0.6

This updates dennis to 0.6. This should add line numbers to the postatus
reports which will be very nice.
Make kb_rebuilds nicer to the celery workers.
Fix really epically dumb string concatenation issue
[bug 1113162] Remove django-cache-machine part I.

Stop using the magical caching manager.
[bug 1113118] Remove invalidate().

It is no longer necessary now that we dropped django-cache-machine
s/uncached/objects/