Implement a basic version of File.dirname
Implement a basic version of File.dirname

Not perfect, but good enough to get rubyspec moving along.

rajthilakmca/grubby,kachick/grubby,grubby/grubby,slawosz/grubby,rajthilakmca/grubby,kachick/grubby,slawosz/grubby,grubby/grubby,slawosz/grubby,rajthilakmca/grubby,kachick/grubby,grubby/grubby