Add OnyX for Lion cask
user
```ruby
class OnyxLion < Cask
  url 'http://www.titanium.free.fr/download/107/OnyX.dmg'
  homepage 'http://www.titanium.free.fr/downloadonyx.php'
  version '2.4.8'
  sha1 '830c72d93494c4d77b1e216fda25d77b56660a0e'
  link 'OnyX.app'
end
```
assistant