Big push tonight

Just a not that I did a big push of functionality tonight.

- RSS feeds are now operational for: comments, entries, entries
filtered by category and comments by entry
- Event system is active for
- RSS cache cleanup observer: so it cleans cached RSS feeds if new
posts are made or managed
- RSS caching system and settings panel so you can control if RSS
caching is enabled, timeouts and idle timeouts

BBHelper updates
Updated the bbhelper plugin to return to you context based objects
getCurrentEntry(), getCurrentComments(), getCurrentCommentsCount(),
getCurrentEntries(), getCurrentCategories()
Updates for context location awareness
isEntryView(), isIndexView()

With these methods layouts can use it to split when you are on entry
or index view.

More testing on entry generation and commenting has now XSS applied
via our Antisamy project.