EiffelStudio Homebrew package.

I've been told to do a PR here although I'm not sure how this would work for end users to get eiffelstudio without fidling with the homebrew configuration.

Thanks,
Manu
Since this isn't running in a shell, the glob isn't doing what you expect. You can do:

```ruby
prefix.install Dir["Eiffel_14.05/*"]
```