Add clipgrab 3.4.9: web video downloader and converter

pkgs/applications/video/clipgrab/clipgrab.desktop

···
+[Desktop Entry]
+Encoding=UTF-8
+Name=ClipGrab
+GenericName=Web video downloader
+Comment=A friendly downloader for YouTube and other sites
+Type=Application
+Categories=Qt;AudioVideo;Audio;Video;
+Icon=clipgrab
+Exec=clipgrab
+Terminal=false

pkgs/applications/video/clipgrab/default.nix

···
+{ stdenv, fetchurl, qt4 }:
+
+let version = "3.4.9"; in
+stdenv.mkDerivation rec {
+  name = "clipgrab-${version}";
+
+  src = fetchurl {
+    sha256 = "0valq3cgx7yz11zcscz1vdjmppwbicvg0id61dcar22pyp2zkap1";
+    url = "http://download.clipgrab.de/${name}.tar.bz2";
+  };
+
+  meta = with stdenv.lib; {
+    inherit version;
+    description = "Video downloader for YouTube and other sites";
+    longDescription = ''
+      ClipGrab is a free downloader and converter for YouTube, Vimeo, Metacafe,
+      Dailymotion and many other online video sites. It converts downloaded
+      videos to MPEG4, MP3 or other formats in just one easy step.
+    '';
+    homepage = http://clipgrab.org/;
+    license = with licenses; gpl3Plus;
+    platforms = with platforms; linux;
+    maintainers = with maintainers; [ nckx ];
+  };
+
+  buildInputs = [ qt4 ];
+
+  configurePhase = ''
+    qmake clipgrab.pro
+  '';
+
+  enableParallelBuilding = true;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    install -Dm755 clipgrab $out/bin
+
+    mkdir -p $out/share
+    install -Dm644 icon.png $out/share/pixmaps/clipgrab.png
+    install -Dm644 ${./clipgrab.desktop} $out/share/applications/clipgrab.desktop
+  '';
+}

pkgs/top-level/all-packages.nix

···
     enableNetworkManager = config.networking.networkmanager.enable or false;
   };
 
+  clipgrab = callPackage ../applications/video/clipgrab { };
+
   clipit = callPackage ../applications/misc/clipit { };
 
   bomi = callPackage ../applications/video/bomi {