Add a link to the apt package manager from Debian man pages.

- We're (slowly) moving away from the Linuxbrew name, now Linux is
  officially supported.

Linuxbrew is available on linux and WSL

[ci skip]

Squash on merge

Fixes #718 by documenting that the package is in the official repository now, or perhaps there is also a need for a package for the current stable Debian version.

[ci skip]

[ci skip]

Go 1.8 doesn't have the `testing.Helper()` method
https://travis-ci.org/github/hub/jobs/481181084

See #1404, closes #1929 [ci skip]

The `hub` package is out of date and repeated attempts to contact the
maintainer and take over the package have failed.

https://chocolatey.org/packages/hub
https://github.com/github/hub/issues/1288
https://github.com/twsouthwick/github-hub-chocolatey/issues/1

Arch Linux has hub in its official repository. But I spent an hour installing go and other things because I thought hub would not be in the official repository.

[ci skip]

The only thing that has substansively changed is that Go 1.8 handles
redirect logic more safely than previous versions. This means we can
drop our special handling to avoid following redirects to other
domains. We were only doing that to protect against the possibility
of leaking auth headers. With Go 1.8, the auth headers are not
forwarded when following a redirect to another domain, so we don't
need our special handling any more.

As long as people are attempting to build with the Makefile, the new
check_go_version script should cause the build to stop if our
collaborators aren't using at least version 1.8 of go.

These are very old projects from another time. Today, it doesn't make
sense to try to list similar projects, as they are easily discoverable
through other means. In the recent years, hub hasn't taken direct
inspiration from projects other than git.

Closes #1345

compliation -> compilation

Installs hub binary and man pages into `/usr/local` by default.

Fixes #1291

[ci skip]