Fixed the miss named commented out keys in conduit-example.toml.

This also bumps ruma to latest and removes js_int infavor of the ruma
re-export

We didn't implement it, but this will stop clients from retrying the
endpoint every minute

remaining bug: conduit sends presence updates every 5 minutes even if
the user is already offline

This enables federation by default

TODO: we need to send pdus if a user of the appservice is in the room
but not the appservice user itself

Also query SRV records when well-known is not found, fixes #29

this also reverts some stateres changes

The latest state-res crate uses ruma's PduRoomV3 PDU's which don't have
tuples of (EventId, EventHashs) like previous versions did (this was
left from rebasing onto master). The Media DB
now takes an optional content_type like the updated ruma structs.