Move IntelliJ Ultimate 12 to caskroom
user
```ruby
class IntellijIdeaUltimate12 < Cask
  url 'http://download.jetbrains.com/idea/ideaIU-12.1.6.dmg'
  homepage 'https://www.jetbrains.com/idea/index.html'
  version '12.1.6'
  sha1 '4d0cb823bf0ff154357aedc1eee8eca3974556a3'
  link 'IntelliJ IDEA 12.app'
end
```
assistant