These are the ones that are auto-installed without tapping and it makes
sense to make them more prominent in our documentation as we've
offloaded various functionality over the years to each of them.

Update some messaging based on recent user confusion and the
`/usr/local/Homebrew` and Ruby 2 migrations.

Fix updating the `stable` branch used for tagged updates and ensure
that the core tap isn’t retapped (the slowest part by far of this test).

`brew list --verbose <formulae>` lists only those kegs that
are installed and exits with 0 if all <formulae> installed.
If one or more formulae from <formulae> are not installed, the
command lists only installed versions and exits with 1.

`brew --pinned formula` exits with 1 if formula is not pinned.

Fixes #1172

This is no longer relevant after moving to taps/tags and if ever
re-added it should probably target homebrew/core.

Fixes #1194.

Fixes https://github.com/Homebrew/homebrew-test-bot/issues/3

Fixes #788.

Apparently this is still run by people so let's tell them to save
some typing.

This option is used to test updating between tags.

As requested in #1199 this updates the documentation accordingly for
that change.

This allows having a shared style that’s use for Homebrew/brew and taps
which can be overridden by Homebrew/brew.

Set the manpage date to the existing one if we're checking for changes.
This avoids the only change being e.g. a new date.

The --fail-if-changed option will cause `brew man`
to return a failing status code if the man files
have changed.

Older versions of Git don't have this flag and we don't want to block
updates for them when there's a (relatively) simple workaround.

some build systems check ac_cv_search_clock_gettime instead of
ac_cv_func_clock_gettime so the former should also be set to "no"

libev.m4 unsets ac_cv_func_clock_gettime, but if ac_have_clock_syscall
is defined, it will leave ac_cv_func_clock_gettime alone:

  http://cvs.schmorp.de/libev/libev.m4?view=markup#l23