A directory-category for terminal emulators

This is a mostly cosmetical commit, in the sense it doesn't change the contents
of any package, but reorganizes the overall Nixpkgs expressions.

Terminal emulators are an ubiquitous tool for any Unix user; even the beginners
are routinely familiarized to it. And, manifestly, there are many
implementations of terminal emulators out there, from those traditionally made
in C and C++ to those written in Haskell and Go.

Terminal emulators deserve more highlight. This commit does that by creating a
category for them.

pkgs/applications/terminal-emulators/evilvte/default.nix

@@ -0,0 +1,38 @@
+{ stdenv, fetchgit, makeWrapper, pkgconfig,
+  gnome2, glib, pango, cairo, gdk-pixbuf, atk, freetype, xorg,
+  configH ? ""
+}:
+
+stdenv.mkDerivation {
+  pname = "evilvte";
+  version = "0.5.2-20140827";
+
+  src = fetchgit {
+    url = "https://github.com/caleb-/evilvte.git";
+    rev = "8dfa41e26bc640dd8d8c7317ff7d04e3c01ded8a";
+    sha256 = "70f1d4234d077121e2223a735d749d1b53f0b84393507b635b8a37c3716e94d3";
+  };
+
+  buildInputs = [
+    gnome2.vte glib pango gnome2.gtk cairo gdk-pixbuf atk freetype xorg.libX11
+    xorg.xorgproto xorg.libXext makeWrapper pkgconfig
+  ];
+
+  buildPhase = ''
+    cat >src/config.h <<EOF
+    ${configH}
+    EOF
+    make
+  '';
+
+  meta = with stdenv.lib; {
+    description = "VTE based, highly customizable terminal emulator";
+    homepage = "http://www.calno.com/evilvte";
+    license = licenses.gpl2;
+    maintainers = [ maintainers.bodil ];
+    platforms = platforms.linux;
+    knownVulnerabilities = [
+      "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854585"
+    ];
+  };
+}