Set is Printable.
Set conforms to Hashable.

This is implemented using a hash function based on Bob Jenkins’ One at a Time hash.
Allow unindexed subscripted get/set.
Syntax for array literals has changed.
Publish all the things.
b5 compat.
Merge branch 'master' into keeping-up-with-the-swiftses

Conflicts:
	Set/Set.swift