Merge pull request #504 from NicoleRauch/master

ical-Berechnungen in eigenes Modul herausgezogen
adding style to images in markdown fields to restrict their width
Merge pull request #505 from leider/master

adding style to images in markdown fields to restrict their width
Properly convert \r\n in DESCRIPTION to \n to meet current node-icalendar api.

Ref #131.
Properly convert \r\n in LOCATION to \n to meet current node-icalendar api.

Closes #131.
Merge pull request #506 from herr-biber/master

Fix creation of ical export to meet standards (no single \r).