Remove X-WR-CALNAME (fixes MS Outlook problem)
Merge remote-tracking branch 'FHNW/master'
For ical exports, remove X-WR-CALNAME, X-WR-CALID and X-WR-CALDESC. X-WR-CALNAME caused Outlook to create a new calendar on every import. These properties are not neccessary and not specified by RFC5545 anyways. Fixes #109, closes #132.