Add .ruby-version, .ruby-gemset, and .rspec to .gitignore.
Update specs to run under rspec 2 (and, incidentally, Ruby 1.9.3.)
Add missing <code> tag to README. Without it '__FILE__' was interpreted as italic.
Add Gemfile and rspec dev dependency to gemspec.
rake spec task running with rspec 2.
Switch from rcov to simplecov for 1.9+ support.
Update package task.
Remove a stray comment.
Improve and optimize even more.