[Ironruby-core] Code Review: core/module/autoload

[Jimmy Schementi]

http://github.com/jschementi/ironruby/commit/bbfa3c4a35cc331e58fb9da9a4097de86ed0dbff

autoload uses '/' to join load-path and autoload-path.
Fixes http://ironruby.codeplex.com/WorkItem/View.aspx?WorkItemId=674

This makes Rails 2.3.2 startup without any modifications! =)

Changes:
- Merlin/External.LCA_RESTRICTED/Languages/IronRuby/mspec/rubyspec/core/module/autoload_spec.rb
- Merlin/External.LCA_RESTRICTED/Languages/IronRuby/mspec/rubyspec/core/module/fixtures/autoload_join.rb
- Merlin/Main/Languages/Ruby/Ruby/Runtime/Loader.cs