And as I use it quite a lot on my projects, finally, I've created a rubygem for it. It's available at the gemcutter service now.
So if you use the project, you might just install it from there.
gem sources -a http://gemcutter.org
gem install front-compiler
Along with the rubygem I've added a simple console tool to work with the compressor
$ frontcc file1.js file2.js ....