make the client much more permissive for Facebook links from the server
make the client much more permissive for Facebook links from the server

Previously we used to get a link like https://facebook.com/dialog/feed,
but that's changing now that we have login/permissions requirements. Get
rid of the client logic that enforces the exact form of the URL. We
don't know what the final form will be yet, but the current production
client is going to reject it whatever it is, and we need to change that
ASAP.

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client