add lolcommits to overlay

based on work by Farid Zakaria https://github.com/fzakaria/lolcommits-nixpkgs

home/ov/lolcommits-nixpkgs/default.nix

@@ -0,0 +1,16 @@
+{ nixpkgs ? import <nixpkgs> { }, lib ? nixpkgs.lib, bundlerApp ? nixpkgs.bundlerApp
+, makeWrapper ? nixpkgs.makeWrapper, mplayer ? nixpkgs.mplayer
+, imagemagick ? nixpkgs.imagemagick }:
+
+bundlerApp {
+  pname = "lolcommits";
+  gemdir = ./.;
+  exes = [ "lolcommits" ];
+  buildInputs = [ makeWrapper mplayer imagemagick ];
+
+  postBuild = ''
+    wrapProgram $out/bin/lolcommits --prefix PATH : ${
+      lib.makeBinPath [ mplayer imagemagick ]
+    }
+  '';
+}