Add wkhtmltox package

packages/wkhtmltox.rb

+require 'package'
+
+class Wkhtmltox < Package
+  description 'Convert HTML to PDF using Webkit (QtWebKit)'
+  homepage 'https://wkhtmltopdf.org/'
+  version '0.12.4'
+  case ARCH
+  when 'i686'
+    source_url 'https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.4/wkhtmltox-0.12.4_linux-generic-i386.tar.xz'
+    source_sha256 '4087b264ec860ab0b0f9b7299ef733fc51e8e39f42047a06724b7450016ab9b8'
+  when 'x86_64'
+    source_url 'https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz'
+    source_sha256 '049b2cdec9a8254f0ef8ac273afaf54f7e25459a273e27189591edc7d7cf29db'
+  end
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.install
+    system "mkdir -p #{CREW_DEST_PREFIX}"
+    system "cp -r bin/ #{CREW_DEST_PREFIX}"
+    system "cp -r lib/ #{CREW_DEST_PREFIX}"
+    system "cp -r share/ #{CREW_DEST_PREFIX}"
+    system "cp -r include/ #{CREW_DEST_PREFIX}"
+  end
+end