Pete's activity stream. (Sometimes not chronological.)

Fix the tests.

This is a total hatchet-job, but the tests seem to do a lot of things that they should not.
At any rate, there are no more bare escapes embedded in these files.  I do not know why the
build script wants `make test` to pass.

[D H] chat/message/theme.go
[D H] chat/message/theme_test.go
[D H] chat/message/user.go
[D H] chat/message/user_test.go
[D H] chat/room_test.go
[D H] host_test.go