Delete URI issue at CalDavCalendarCollection#removeCalendar()

[evarfolomeev]

Hello,

https://github.com/ical4j/ical4j-connector/blob/master/src/main/java/net/fortuna/ical4j/connector/dav/CalDavCalendarCollection.java#L510

DeleteMethod deleteMethod = new DeleteMethod(getPath() + "/" + uid + ".ics");

Here I got in debug double "/" before uid as getPath() returns also "/" in the end.
By this reason CalDavCalendarCollection#removeCalendar(String) doesn't work for me.

Probably should be:
DeleteMethod deleteMethod = new DeleteMethod(getPath() + uid + ".ics");

Please check.

[benfortuna]

Created PR #6