[Merge] lp:~penk/gallery-app/sdcard into lp:gallery-app

[Arthur Mello]

@penk, an append at m_mediaDirectories of ""/media/" + userName" should be enough to make gallery-app search for all media files on this dir and on all the subdirs. We do not have a config file for it today but we should think about it
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https://code.launchpad.net/~penk/gallery-app/sdcard/+merge/231587
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