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
e.g
```ruby
env = { :ISE_EIFFEL => prefix, :ISE_PLATFORM => ise_platform }
bin.env_script_all_files(prefix+"studio/spec/#{ise_platform}/bin", env)
bin.env_script_all_files(prefix+"studio/spec/#{ise_platform}/bin", env)
```