Move display name rule

Clean up _ServiceQueuer

Remove dead appservice code

Measure notify_interested_services

Don't update caches replication stream if tokens haven't advanced

To port existing rule actions & enable entries to the new name

Fix up preview URL API. Add tests.

This includes:

- Splitting out methods of a class into stand alone functions, to make
  them easier to test.
- Adding unit tests to split out functions, testing HTML -> preview.
- Handle the fact that elements in lxml may have tail text.

Limit number of extremeties in backfill request

Refactor user_delete_access_tokens. Invalidate get_user_by_access_token to slaves.

This works around a bug where if we make a backfill request with too
many extremeties it causes the request URI to be too long.

Merge branch 'fix_integrity_retry' of https://github.com/Ralith/synapse into Ralith-fix_integrity_retry

As per https://github.com/matrix-org/matrix-doc/pull/373 and comment

Split out /events to synchrotron

Signed-off-by: Benjamin Saunders <ben.e.saunders@gmail.com>

Fix some bugs in the auth/ldap handler