Added dropbox emblem icons
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Added nm-device-wired-secureB (the same original icon with a transparent lock)
First modification to pull request #63: moved the type of nm-vpn-connecting* from being true files to symlinks to ../apps/nm-device-secure* . This has both the advantage to save some space, and to keep all of the original files into the apps folder. The appearance is the maintained, thougn.