Attempt at adding 'pinta'. It still does not build due to mono problems.

Nevertheless, I updated the gnome attribute names a bit so all that
gtk-sharp-2 goes a bit beyond.

svn path=/nixpkgs/trunk/; revision=22287

pkgs/applications/graphics/pinta/default.nix

@@ -0,0 +1,17 @@
+{stdenv, fetchurl, mono, gtksharp, pkgconfig}:
+
+stdenv.mkDerivation {
+  name = "pinta-0.3";
+
+  builder = ./builder.sh;
+  src = fetchurl {
+    url = http://download.github.com/jpobst-Pinta-0.3-0-g94f6e82.tar.gz;
+    sha256 = "0qvpz9602igjmv8ba6vc4kg9jj3yyw0frl7wgz62hdxiizdfhm2f";
+  };
+
+  makeWrapper = ../../../build-support/make-wrapper/make-wrapper.sh;
+
+  buildInputs = [mono gtksharp pkgconfig];
+
+  inherit gtksharp;
+}