update tunnelblick

* update to 3.4.2
* add uninstall stanza
* change license to :gpl
* add supported versions to caveats

Casks/tunnelblick.rb

@@ -1,13 +1,22 @@
 cask :v1 => 'tunnelblick' do
-  version '3.4.1_r3054'
-  sha256 '44a9b1986c100698c82186c4ce404d5acf34f292d08c5f8528c33e22646f955a'
+  version '3.4.2_build_4055.4161'
+  sha256 '19cd879009d8f6989abd1f7e1ed1feb5dc68995f3146e08c547d4b64d3679c5b'
 
   url "https://downloads.sourceforge.net/project/tunnelblick/All%20files/Tunnelblick_#{version}.dmg"
   appcast 'https://www.tunnelblick.net/appcast.rss',
           :sha256 => '7fa119cda4d782dc61cb75895c70b3572652df737c908270c48a09d67a874592'
   homepage 'https://code.google.com/p/tunnelblick/'
-  license :oss
+  license :gpl
 
   app 'Tunnelblick.app'
-  caveats 'For security reasons, Tunnelblick must be installed to /Applications and will request to be moved at launch.'
+  uninstall :launchctl => 'net.tunnelblick.tunnelblick.LaunchAtLogin',
+            :quit      => 'net.tunnelblick.tunnelblick'
+
+  caveats do
+    os_version_only *%w(10.4 10.5 10.6 10.7 10.8 10.9 10.10)
+    <<-EOS.undent
+    For security reasons, Tunnelblick must be installed to /Applications,
+    and will request to be moved at launch.
+    EOS
+  end
 end