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
There are ways to achieve that but it will take me some time before I can achieve something realistic. I was hoping to have this first version in so that people can test the package using our traditional way of using EiffelStudio, which is to define 2 environment variables:
ISE_EIFFEL (here it should be set to /usr/local/Cellar/eiffelstudio/14.05
ISE_PLATFORM (here to be set to either macosx-ppc, macosx-x86 or macosx-x86-64)