2008-04-14  Juerg Billeter  <j@bitron.ch>

	* gee/arraylist.vala, gee/hashmap.vala, gee/hashset.vala,
	  gee/iterator.vala, gee/list.vala, gee/map.vala,
	  gee/readonlycollection.vala, gee/readonlylist.vala,
	  gee/readonlymap.vala, gee/readonlyset.vala: mark types as
	  nullable where appropriate

svn path=/trunk/; revision=29