[PATCH] Adopt Go workspace best practices

[Filippo Valsorda]

Relative imports break when the project is built from within GOPATH,
where most Go developers prefer to develop:

    device.go:10:2: local import "./ratelimiter" in non-local package
    tun_darwin.go:10:2: local import "./rwcancel" in non-local package
    noise-protocol.go:10:2: local import "./tai64n" in non-local package
    cookie.go:10:2: local import "./xchacha20poly1305" in non-local package

On the other hand, the vendor folder is not supported outside of
GOPATH, so it's unclear how/if that ever worked.

Moreover, using go get instead of dep means that dependencies are not
pinned, and HEAD is used instead, which makes builds unreproducible.

This adds a Makefile that creates a local GOPATH with a symlink
trick, so developing outside GOPATH still works. Not only that, but
a system GOPATH is not required at all as long as the Makefile is used.
And if the project is cloned in the right place in GOPATH all standard
tools will work as expected.

So all workflows should work just as weel or better. The only new
requirement is dep, but that's unavoidable for reproducible builds.

Finally, run goimports on all files to format import statements.
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