[Fluxus] fluxus in homebrew (osx)

[gabor papp]

> here's a first attempt:
nicely done. works fine with macports. added to git. thanks.

> i'm not sure why i need to add racket3m to Libs everywhere, couldn't
> this be set globally in the toplevel SConstruct?
we could do this and pass Libs and Frameworks to module sconscripts. 
this was not really necessary before, because the modules have no common 
library dependencies apart from racket.

gabor