Add transmission-nightly cask

Casks/transmission-nightly.rb

@@ -0,0 +1,18 @@
+cask :v1 => 'transmission-nightly' do
+  version '14489'
+  sha256 '07453f41cf4c14cf66fdd5822f5ac311de4a22e5cb472fd029b19f9dd7eebfb6'
+
+  url "https://build.transmissionbt.com/job/trunk-mac/lastSuccessfulBuild/artifact/release/Transmission-#{version}.dmg"
+  name 'Transmission'
+  homepage 'http://www.transmissionbt.com/'
+  license :gpl
+
+  app 'Transmission.app'
+
+  zap :delete => [
+                  '~/Library/Application Support/Transmission',
+                  '~/Library/Preferences/org.m0k.transmission.plist',
+                  '~/Library/Preferences/org.m0k.transmission.LSSharedFileList.plist',
+                  '~/Library/Caches/org.m0k.transmission',
+                 ]
+end