Add cask for Opera Mobile Emulator
user
```ruby
class OperaMobileEmulator < Cask
  url 'http://get.geo.opera.com/pub/opera/sdlbream/1210/Opera_Mobile_Emulator_12.1_Mac.dmg'
  homepage 'http://www.opera.com/developer/mobile-emulator'
  version '12.1'
  sha1 '20e72b61c42d6b031fb488b8af342cd4d3698504'
  link 'Opera Mobile Emulator.app'
end
```
assistant