Added Yandex browser cask

```
➜  ~  "$(brew --prefix)/Library/Taps/phinze/homebrew-cask/developer/bin/cask_namer" /Volumes/Yandex/Yandex.app
Proposed Cask name:          yandex
Proposed file name:          yandex.rb
First Line of Cask:          class Yandex < Cask
```