Log Message:
Update to Dovecot 1.1beta8.

Changes since beta7:

- Added a new "raw" mail storage backend which allows opening \ 
files/streams as
  single mail mailboxes. deliver uses this now instead of opening the incoming
  mail as a mbox. So deliver should be now faster and it doesn't anymore remove
  Dovecot's private mbox headers if you're not using mbox.
- Cache file tracks message expunges again
- All kinds of other fixes
- Some optimizations

I think we're getting closer to v1.1 RCs.