Fix issue #15.

(org-caldav-rewrite-uid-in-event): Org 8 may add number to 'TS'.
README.md: Re-add Google since they changed their mind.
(testsuite): Google somehow changed timezone handling. Testsuite still
failing later, though.
Disable bbdb aniversaries during export.

(org-caldav-generate-ics): Set
`org-icalendar-include-bbdb-anniversaries' to nil since it is not yet
supported for syncing.