Make sure performance example counts quried tree
add Gemfile
add basic .gemspec
add Rakefile with default :test task and document
gemspec is single point of truth for deps
Make test running more idiomatic

* Use Rake to run all tests (using the standard TestTask).
* Assume that test/ is in the require path (i.e. run individual tests with
  "ruby -Itest"
Test with warnings; fix them
Rake is needed to test with bundle
Ruby stdlib already includes Test::Unit
Add licence (MIT)
Bump version to 1.0.0
Update README

* Reformatting
* Removed section on dependencies, as the gemspec documents this
* Added note on licensing
Annotate Ruby for syntax highlighting
Language blocks must not be indented
Demonstrate use of public_method
Test directory must now be in load path
Note that lambda breaks export/import
Improve code style
Correct Markdown