Use Female/Male and other changes to tidy-data/00-intro
Add untidy data left behind for exercise in tidy-data/01-tidy
Add lesson on how to tidy in tidy-data/01-tidy
Link to second tidy-data lesson from first, now that it exists
Add supplemental material to lesson on data tidying
Explain tidying data lesson in its README
Internal links in the data tidying lesson
Enrich README for tidy data lesson
Polish tidy-data lesson
Fix typo that broke a link
Responding to @ethanwhite comments on pull request for tidy data lesson
Merge pull request #66 from jennybc/master

Add lesson on how to tidy in tidy-data/01-tidy