Merge pull request #13 from monsta/master

Added support for rar 5.0x
file-roller changelog
Removed obsolete GTK+ 3.8
Removed gtk+ dir too, it's not needed anymore
Merge pull request #15 from monsta/remove-gtk

Removed GTK+ dirs and files - they're not needed anymore
Added Yelp
Changed default URI to help:linuxmint
Cleaned up the .desktop file
Added help icons to icon-less books and docbook documents
Yelp changelog
Merge remote-tracking branch 'upstream/master'