Miscellaneous fixes, updates, and image recipes.

I've only been playing with poky on Pi for a few days, but there might be some things of interest to you here.  Mostly Pi-specific appends, a couple of new recipes, and a few test images.  It's mostly based on just the layers in your readme, except for midori (requires meta-gnome) and ntp (requires meta-networking).  Would you be opposed to adding a few recipes to the Pi layer to eliminate those depends?  Do you have a better and/or lighter browser option than midori?  Thanks in advance...