Fix buids -> builds
Use a default that communicates the purpose and also degenerates nicely.
Perform the inclusion filter after traversal for congruency with exclude
Extract out filtering by filename
Extracted directory detection and presence of '.' in name.
Extract path assembly
Extract _looks_like_package
Extract _find_packages_iter
Extracted _all_dirs and rewrote _find_packages_iter as a proper iterator.
Pulled find_package functionality into a PackageFinder class
Created PEP420PackageFinder, whose .find method can be used to find any suitable directory.
Reindent docstring
Update changelog
Bumped to 3.4 in preparation for next release.
Backed out changeset: 78c8cfbe3e10