Add cfr 0_100: another Java decompiler

pkgs/development/tools/java/cfr/default.nix

···
+{ stdenv, fetchurl, jre }:
+
+let version = "0_100"; in
+stdenv.mkDerivation rec {
+  name = "cfr-${version}";
+
+  src = fetchurl {
+    sha256 = "0q5kh5qdksykz339p55jz0q5cjqvxdzv3a7r4kkijgbfjm1ldr5f";
+    url = "http://www.benf.org/other/cfr/cfr_${version}.jar";
+  };
+
+  meta = with stdenv.lib; {
+    inherit version;
+    description = "Another java decompiler";
+    longDescription = ''
+      CFR will decompile modern Java features - Java 8 lambdas (pre and post
+      Java beta 103 changes), Java 7 String switches etc, but is written
+      entirely in Java 6.
+    '';
+    homepage = http://www.benf.org/other/cfr/;
+    license = with licenses; mit;
+    platforms = with platforms; linux;
+    maintainers = with maintainers; [ nckx ];
+  };
+
+  buildInputs = [ jre ];
+
+  phases = [ "installPhase" ];
+
+  installPhase = ''
+    jar=$out/share/cfr/cfr_${version}.jar
+
+    install -Dm644 ${src} $jar
+
+    cat << EOF > cfr
+    #!${stdenv.shell}
+    exec ${jre}/bin/java -jar $jar "\''${@}"
+    EOF
+    install -Dm755 cfr $out/bin/cfr
+  '';
+}

pkgs/top-level/all-packages.nix

···
     ruby = ruby_2_0_0;
   };
 
+  cfr = callPackage ../development/tools/java/cfr { };
+
   chromedriver = callPackage ../development/tools/selenium/chromedriver { gconf = gnome.GConf; };
 
   chrpath = callPackage ../development/tools/misc/chrpath { };