[Ironruby-core] Rvm install

[Enrico Sada]

i am fixing 'rvm install ironruby-head' , not much left to do.

If someone can upload to rubyforge files (
http://rubyforge.org/frs/?group_id=4359 ) ironruby-1.1.3.zip i can
also fix 'rvm install ironruby-1.1.3'