Correctly highlight the current letter on subsequent pages
Save all versions of a formula

Homebrew supports multiple specs (`stable`, `devel` and `head`) for
each formula.

See #22
Improve error messages for import failures
Move latest formula change down
Make use of Formula#update_metadata in Repository#recover_deleted_formulae
Ignore exceptions in eval'd old Homebrew code
Fix Repository spec to support multiple versions
Test all of Formula’s methods
Add the missing spec for Formula#generate_history!
Simplify how commit information is processed
Simplify how formulae information is processed