Update to upstream release 3.0.2
    
     - update to upstream release 3.0.2
     - remove EL6 related macros
     - update URL
     - use specific commit hash to obtain sources from GitHub
     - update BuildRequires and build using CMake
     - build HTML/PDF documentation
     - revert a patch from upstream that requires boost 1.55 (not yet available
       on Fedora)
     - libamounts now known as libledger
     - use man page that is now built by upstream