Currently, when an image served by o:graphicImage is hotlinked/bookmarked, and the server restarts, then images won't be served until the page containing o:graphicImage is requested again.
This can be solved by introducing @GraphicImageBean which should automatically mark the bean as eligible for serving graphic images.
This must make #287 possible.
Fix #289: add @GraphicImageScoped
#289 improved javadoc
#289: Add missing @Inherited to @GraphicImageScoped (needed by OWB)
#289: Rename @GraphicImageScoped to @GraphicImageBean with @Named
(OWB didn't like @Qualifier on @StereoType)