Naming bugfixes.
Logging and notification changes.

- Added log-levels for EMAIL and HTTP. Log-levels are now lower-case strings.
- Changed default email subject.
- Notifications can now be every type.
- Slight HTTP-listener output changes.
- We now notify a change in handlers.
- We now give the notifier to handlers.
- Changed NOTIFY_EMAIL to NOTIFY, and NOTIFY_HTTP to HTTP in the handlers (it's quicker to type).
- We now flatten log messages going to HTTP.