Erik Johnston bc80b3f454 Add helpers for getting prev and auth events (#4139)
* Add helpers for getting prev and auth events

This is in preparation for allowing the event format to change between
room versions.
2018-11-06 00:35:15 +11:00
..
2018-03-13 11:00:04 +00:00
2018-09-27 11:31:51 +01:00
2018-08-29 16:28:25 +02:00
2018-11-02 13:44:14 +00:00