New gnome-sdk images

[Alexander Larsson <alexl redhat com>]

I just pushed an update to the gnome-sdk repos. 
The freedesktop.org images (and thus also the gnome ones) now included
SDL2, and i've packaged the game neverball as org.neverball.Neverball.

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 Alexander Larsson                                            Red Hat, Inc 
       alexl redhat com            alexander larsson gmail com 
He's a sword-wielding one-eyed master criminal fleeing from a secret 
government programme. She's a bloodthirsty kleptomaniac socialite from 
out of town. They fight crime!