Add bastet to the list of default authorities

bastet is the new directory authority run by stefani.

It is now trusted in the Thu Oct 19th 2017 20:00:00 UTC consensus.

The dirauth-conf.git DirServer line is:

DirServer bastet orport=443 v3ident=27102BC123E7AF1D4741AE047E160C91ADC76B21 204.13.164.118:80 24E2 F139 121D 4394 C54B 5BCC 368B 3B41 1857 C413

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information