Add packages for a number of fonts.

The added fonts are

 - Caladea,
 - Carlito,
 - Comfortaa,
 - Comic Relief,
 - Crimson,
 - Fantasque Sans Mono,
 - Lobster Two,
 - Pecita,
 - Quattrocento, and
 - Quattrocento Sans.

pkgs/data/fonts/carlito/calibri-alias.conf

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<fontconfig>
+  <!-- Configure Carlito as a metric-compatible alias for the
+       Microsoft Calibri font family. -->
+  <alias binding="same">
+    <family>Calibri</family>
+    <accept>
+      <family>Carlito</family>
+    </accept>
+  </alias>
+  <alias binding="same">
+    <family>Carlito</family>
+    <default>
+      <family>Calibri</family>
+    </default>
+  </alias>
+</fontconfig>

pkgs/data/fonts/carlito/default.nix

@@ -0,0 +1,40 @@
+{stdenv, fetchurl}:
+
+stdenv.mkDerivation rec {
+  name = "carlito-${version}";
+  version = "20130920";
+
+  src = fetchurl {
+    url = "https://commondatastorage.googleapis.com/chromeos-localmirror/distfiles/crosextrafonts-carlito-${version}.tar.gz";
+    sha256 = "0nmgzp6gdvv4dipswrw0l1bfjp4jbic2qvm7dpqiq71jpin2plab";
+  };
+
+  phases = ["unpackPhase" "installPhase"];
+
+  installPhase = ''
+    mkdir -p $out/etc/fonts/conf.d
+    mkdir -p $out/share/fonts/truetype
+    cp -v *.ttf $out/share/fonts/truetype
+    cp -v ${./calibri-alias.conf} $out/etc/fonts/conf.d/30-calibri.conf
+  '';
+
+  meta = with stdenv.lib; {
+    # This font doesn't appear to have any official web site but this
+    # one provides some good information and samples.
+    homepage = http://openfontlibrary.org/en/font/carlito;
+    description = "A sans-serif font metric-compatible with Microsoft Calibri";
+    longDescription = ''
+      Carlito is a free font that is metric-compatible with the
+      Microsoft Calibri font. The font is designed by Łukasz Dziedzic
+      of the tyPoland foundry and based his Lato font.
+    '';
+    license = licenses.ofl;
+    platforms = platforms.all;
+    maintainers = [maintainers.rycee];
+
+    # Reduce the priority of this package. The intent is that if you
+    # also install the `vista-fonts` package, then you probably will
+    # not want to install the font alias of this package.
+    priority = 10;
+  };
+}