Add (allow-none) and small format fix
Add (allow-none) and move the macro variable for response_status from gdata_calendar_event to gdata_gd_who
Add (allow-none) and fix the precondition for gadget_type
Add (allow-none)
"Add (allow-none): and fix some bugs"
Merge branch 'master' of https://github.com/william7777/libgdata

Conflicts:
	gdata/gd/gdata-gd-when.c
	gdata/gd/gdata-gd-who.c
	gdata/gdata-types.c
	gdata/services/calendar/gdata-calendar-calendar.c
	gdata/services/calendar/gdata-calendar-event.c
	gdata/services/calendar/gdata-calendar-event.h
	gdata/tests/calendar.c