Use new ical4j version to fix timezone bug

* use ical4j 1.0.x-maintenance (self-compiled 27 Oct 2014)
* upstream fixes timezone bug (fixes #186)
* try to turn off the check for time zone updates because it's unnecessary in most cases (fixes #239)
* mention ical4j and its major version in generated iCalendars
* update to ez-vcard 0.9.6 from upstream
* version bump to 0.6.4
Merge branch 'master' of github.com:rfc2822/davdroid