Adding vbox extension to go with virtualbox4330101610

Casks/virtualbox-extension-pack4330101610.rb

@@ -0,0 +1,24 @@
+cask :v1 => 'virtualbox-extension-pack4330101610' do
+  version '4.3.30-101610'
+  sha256 '770d49247976f2a0d14a66196dddf864c6b9d185671e2a29cab459fc28f105db'
+
+  url "http://download.virtualbox.org/virtualbox/#{version.sub(%r{-.*},'')}/Oracle_VM_VirtualBox_Extension_Pack-#{version}.vbox-extpack"
+  name 'VirtualBox Extension Pack'
+  homepage 'https://www.virtualbox.org'
+  license :closed
+  tags :vendor => 'Oracle'
+
+  stage_only true
+
+  container :type => :naked
+
+  postflight do
+    system 'sudo', 'VBoxManage', 'extpack', 'install', '--replace', "#{staged_path}/Oracle_VM_VirtualBox_Extension_Pack-#{version}.vbox-extpack"
+  end
+
+  uninstall_postflight do
+    system 'sudo', 'VBoxManage', 'extpack', 'uninstall', 'Oracle VM VirtualBox Extension Pack'
+  end
+
+  depends_on :cask => 'virtualbox4330101610'
+end