Allow specifying a directory to host a web client from

Add utility to parse config and print out a key

Usage:

```
$ python -m synapse.config read server_name -c homeserver.yaml
localhost
```

Revert previous commit. Instead, always download matrix-angular-sdk as a requirement, but don't complain (when we do check_requirements) if we don't have it when we start synapse.

Don't make pushers handle presence/typing events

When logging in fetch user by user_id case insensitively, *unless* there are multiple case insensitive matches, in which case require the exact user_id

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.