Add totalfinder-beta cask

Casks/totalfinder-beta.rb

@@ -0,0 +1,15 @@
+class TotalfinderBeta < Cask
+  version '1.6.12'
+  sha256 'c7d2d41610fd2ec0e944120755ebd7fbcc7518d5d5b0f34ff55da3cb467831b8'
+
+  url 'http://downloads.binaryage.com/TotalFinder-1.6.12.dmg'
+  homepage 'http://totalfinder.binaryage.com/'
+  license :unknown
+
+  pkg 'TotalFinder.pkg'
+  uninstall :pkgutil => 'com.binaryage.pkg.totalfinder.app',
+            :script => {
+                        :executable => 'TotalFinder Uninstaller.app/Contents/MacOS/TotalFinder Uninstaller',
+                        :args => %w[--headless],
+                       }
+end