Add Cask for Ninja Blocks Client v0.2
user
```ruby
class Ninjablocks < Cask
  url 'https://dl.dropboxusercontent.com/u/428557/NinjaBlocks-0.2.dmg'
  homepage 'http://forums.ninjablocks.com/index.php?p=/discussion/1655/ninja-osx-client/p1'
  version '0.2'
  sha1 '79b5040e42aff4bcf2286c0d6142b7d81c9cc5aa'
  link 'NinjaBlocks.app'
end
```
assistant