Added find_duplicate_filenames.rb.
Made some APIs compatible with mac in GnomeHelper, and moved them to the new DesktopHelper.
Disabled BashHelper#quote_bash_string, because it's broken.
Added obsolete script sort_rdf_file.rb
Added script fast_set_mame32_roms.rb.
Added start_rails.rb, for starting a rails app and opening a browser.