Add tidy package

packages/tidy.rb

+require 'package'
+
+class Tidy < Package
+  description 'The granddaddy of HTML tools, with support for modern standards'
+  homepage 'http://www.html-tidy.org/'
+  version '5.6.0'
+  source_url 'https://github.com/htacg/tidy-html5/archive/5.6.0.tar.gz'
+  source_sha256 '08a63bba3d9e7618d1570b4ecd6a7daa83c8e18a41c82455b6308bc11fe34958'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system "cmake . -DCMAKE_INSTALL_PREFIX=#{CREW_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system "make", "LIBDIR=#{CREW_LIB_PREFIX}", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end