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
In fact, yes, I made a mistake above:
```ruby
bin.install prefix+"studio/spec/#{ise_platform}/bin/exec_to_wrap", prefix+"studio/spec/#{ise_platform}/bin/another_exec_to_wrap"
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)
```