Extensions for KDE and Nautilus

Signed-off-by: Sander Lepik <sander@lepik.eu>
Change CMake variable, as per comment from Raul Metsma (https://github.com/open-eid/qdigidoc/pull/1#discussion_r20152513)

Signed-off-by: Sander Lepik <sander@lepik.eu>
Clean up whitespace mess

Signed-off-by: Sander Lepik <sander@lepik.eu>
Add license information and author information

Signed-off-by: Sander Lepik <sander@lepik.eu>