Some updates

This last week I have done the following:

1) Found and squashed a bug resulting in the xine_panel seg faulting on
destruction (thanks to vhmauery for the extra set of eyes.. two extra
sets actually... nevermind... :-)

2) Added background image support to states.  There is now another named
constructor that accepts a std::string bg_image_path as its last
argument.  It needs to be the path and not an image::ptr since the
image::create call requires a surface and the state object isn't
constructed before we need it.

Darren