Suggestion: use real capitalization

Currently with ir, we have

C:/dev/ruby/os/rakefile:23

within

C:\dev\ruby\os>rake -T
(in C:/dev/ruby/os)
rake aborted!
no such file to load – spec/rake/spectask
C:/dev/ruby/os/rakefile:23

In reality, rakefile’s name is Rakefile (I know it doesn’t matter, it’s
a bit jarring).

Suggestion: lookup and use the normal capitalization for filenames.

Thanks!
-rp