iteration 1 - Use gobject for events in feed, summaryitem and feedlist

iteration 1 - Use gobject for events in feed, summaryitem and feedlist

 - initial use of gobjects for events handling
   in Feed, SummaryItem, and FeedList

 - affected modules below.

 - unused modules were deleted. this modules have been refactored.

	modified:   src/lib/Application.py
	deleted:    src/lib/CategorySelector.py
	deleted:    src/lib/Feed.py
	modified:   src/lib/FeedCategoryList.py
	deleted:    src/lib/FeedItems.py
	deleted:    src/lib/FeedList.py
	modified:   src/lib/FeedListView.py
	modified:   src/lib/FeedPropertiesDialog.py
	modified:   src/lib/Find.py
	modified:   src/lib/ItemStore.py
	modified:   src/lib/OPMLImport.py
	modified:   src/lib/PollManager.py
	modified:   src/lib/PreferencesDialog.py
	deleted:    src/lib/QueueDict.py
	modified:   src/lib/SummaryItem.py
	modified:   src/lib/dialogs.py
	new file:   src/lib/feeds.py
	modified:   src/lib/subscribe.py

git-svn-id: svn+ssh://svn.gnome.org/svn/straw/trunk@305 141a2093-ea25-0410-9ad2-d44d734a8f13