add Vagrant163 and VirtualBox4312

Casks/vagrant163.rb

@@ -0,0 +1,8 @@
+class Vagrant163 < Cask
+  url 'https://dl.bintray.com/mitchellh/vagrant/vagrant_1.6.3.dmg'
+  homepage 'http://www.vagrantup.com'
+  version '1.6.3'
+  sha256 'ed1de41ca11a2251e4748a7a88fb46c3312780b7952f2248683f8ed2a007bc72'
+  install 'Vagrant.pkg'
+  uninstall :script => { :executable => 'uninstall.tool', :input => %w[Yes] }
+end

Casks/virtualbox431293733.rb

@@ -0,0 +1,8 @@
+class Virtualbox431293733 < Cask
+  url 'http://download.virtualbox.org/virtualbox/4.3.12/VirtualBox-4.3.12-93733-OSX.dmg'
+  homepage 'http://www.virtualbox.org'
+  version '4.3.12-93733'
+  sha256 'a9d9e3b3217177bc175839747de663ba25886f71e97a9c35ad802f618f11e23e'
+  install 'VirtualBox.pkg'
+  uninstall :script => { :executable => 'VirtualBox_Uninstall.tool', :args => %w[--unattended] }
+end