ena 0.13.1

Union-find, congruence closure, and other unification code. Based on code from rustc.
Documentation 
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base
test unify::tests::big_array_bench ... bench:     740,192 ns/iter (+/- 35,823)
test unify::tests::big_array_bench ... bench:     745,031 ns/iter (+/- 240,463)
test unify::tests::big_array_bench ... bench:     762,031 ns/iter (+/- 240,463)
test unify::tests::big_array_bench ... bench:     756,234 ns/iter (+/- 264,710)