Rename `auto` to `wdteutil`

wdteutil: rename from `auto` (#187)

* wdteutil: Rename from `auto`.

* wdteutil: Remove accidentally included `fmt.Println()` call.

Woops. I wonder how long that's been there for... `git blame` time, I
guess.

* std: Remove some references to scope bounds from the Godoc comments.

* wdte: Update some dependencies.

* wdte: Parallelize the tests.

* multiple: Fix some golint and go vet warnings.