[tor-relays] bwauth graph for August 2015

[starlight.2015q3 at binnacle.cx]

In addition to reducing Unmeasured=1 relays
from ~350 to ~150, the combination of the
new Torflow release and addition of the
Faravahar BWauth have dramatically improved
the reliability and stability of bandwidth
measurements of relays, for both the
individual BWauth values and consensus values.

This shows up most clearly in the 3-month
and 1-year Atlas graphs of consensus
weights.