Add opera-neon (#3129)

Casks/opera-neon.rb

@@ -0,0 +1,15 @@
+cask 'opera-neon' do
+  version :latest
+  sha256 :no_check
+
+  url 'http://get.geo.opera.com/.private/OperaNeon.dmg'
+  name 'Opera Neon'
+  homepage 'http://www.opera.com/computer/neon'
+
+  app 'Opera Neon.app'
+
+  zap delete: [
+                '~/Library/Application Support/Opera Neon',
+                '~/Library/Caches/Opera Neon',
+              ]
+end