Correct pynacl version to 0.3.0

0.0.3 was a typo

Clean up some of restructured text formatting in the README.rst

Add generic update instructions to UPGRADE.rst

Add m.room.avatar to default power levels.

Fix set password

Add m.room.avatar to default power levels. Change default required power levels of such events to 50

Push: store the 'last_token' in the db, even if we processed no events

Always return a thumbnail of the requested size.

Add server side support for canonical aliases

Support logging in with email addresses (or other threepids)

Changes for unique emails

Don't get apservice interested rooms in RoomHandler.get_joined_rooms_for_users

Ensure we never return a None event from _get_state_for_groups

Set request.authenticated_entity for application services

Re-enable receipts API.

Fix pending_calls metric to not lie