Merge pull request #38 from BarrensZeppelin/master

Widen key constraint to 'any' for maps and sets

Merge pull request #34 from laher/sets

Set + SortedSet with tests

Merge pull request #30 from laher/master

readme updates for latest changes

Merge pull request #23 from laher/master

Adds generics

Merge pull request #16 from benbjohnson/refactor-builders

Refactor builders

Merge pull request #13 from benbjohnson/circleci

Remove CircleCI

Merge pull request #9 from benbjohnson/readme

Change hasher & comparer implementations to unexported in README

Fix sorted map iterator initialization.