Whitespace from blobs in devhub (bug 846515)

Remove it all
CSS and doc changes (bug 846515)
bumped django-statsd-mozilla to 0.3.8.6
don't localize git clone
MKT admin requires zamboni/css for reasons beyond me
this pains me: continue to use AMO's bundles for Marketplace admin
we are extending from AMO bundles again so unnecessary
remove unnecessarily duplicated bundle blocks in ecosystem pages
group media queries for Reviewer Tools styles
include highcharts higher in the zamboni/editors bundle