ikhal: fixing an off by one error on allday events
ikhal: newly created events are in the local timezone
ikhal: can convert events from allday to datetime
ikhal: did some cleanup
ikhal: moved StartEndEditor to own file
bugfix: can now shorten allday events by 1 day

StartEndEditor now knows nothing about how VCARD uses DTEND (i.e. first
day the event is NOT on anymore).  Instead that logic has been moved
into the EventEditor.
setting default calendar

The default calendar can now be set in the config file.
This should fix #63 on github
Merge github.com:geier/khal

Conflicts:
	khal/ui/__init__.py