Fixed outdated import
Add a set implementation for the names.Tag type
set/tags: update tests per review comments
utils/set: make interfaces private
set/tags: more test updates
utils/set: clean up Tags tests
Merge pull request #35 from wwitzel3/ww3-tag-set

Add a set implementation for the names.Tag type
Merge update to use gopkg.in/check.v1
go fmt fixup