Add libuninum package

packages/libuninum.rb

+require 'package'
+
+class Libuninum < Package
+  description 'This is a library for converting Unicode strings to numbers and numbers to Unicode strings.'
+  homepage 'http://billposer.org/Software/libuninum.html'
+  version '2.7'
+  source_url 'http://billposer.org/Software/Downloads/libuninum-2.7.tar.bz2'
+  source_sha256 'e704983c3c00e9b76bd836b8b83ce31bfe4eb1752eee8be123cf97c1275076ea'
+
+  def self.build
+    system './configure'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end