[sugar] new experimental "News Reader Lite"

[Owen Williams]

I've started hacking on a Lite version of the news reader which should
be much friendlier to the olpc platform in terms of memory,
multi-instance friendliness, and UI.  It's called "NewsReaderLite" and
it launches, and displays content (but not much more).

To enable, edit the activity.info file and change the class to
NewsReaderLite.NewsReaderLite.

The UI is in proof-of-concept mode, but it should communicate what an
ultra-simple feed reader might look like.

TODO:
* inital db init and default feeds
* adding feeds
* multi-instance detection
* basic feed-poll callbacks


Owen