[CMake] Bundle Generator Background Image/Custom .DS_Store support

[Mike Arthur]

Please review the attached patch for inclusion.

It adds support to the bundle generator to add a background image and 
.DS_Store for people (like myself/Mozilla/Last.fm) who want CPack to be able 
to set a nice background to the Bundle without having to manually convert it.
-- 
Cheers,
Mike Arthur
http://mikearthur.co.uk/
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