Add Scythebill.rb v12.6.0

Scythebill is a desktop application for birders to keep track of
their life lists and birding records.

Casks/scythebill.rb

@@ -0,0 +1,18 @@
+cask :v1 => 'scythebill' do
+  version '12.6.0'
+  sha256 '463612974cb2686eea3edc78f8587098087da88ca8cf6b13103e85fe8c182a89'
+
+  # amazonaws.com is the official download host per the vendor homepage
+  url "https://s3.amazonaws.com/downloads.scythebill.com/scythebill-#{version}-mac-lion.zip"
+  name 'Scythebill'
+  homepage 'http://www.scythebill.com/'
+  license :apache
+
+  container :nested => "Scythebill #{version}.dmg"
+  app 'Scythebill.app'
+
+  caveats <<-EOS.undent
+    #{token} requires Java 6+, you can install the latest Java using
+      brew cask install java
+  EOS
+end