Update my name in Kickstarter-Supporters, add .mailmap

Fixing link to CODE_OF_CONDUCT.md within CONTRIBUTING.md

fixed link url to navigate to main brew repo instead of forked repo

CODE_OF_CONDUCT: rename from CODEOFCONDUCT.

So GitHub can detect it.

formulary: handle unreadable bottle formula.

Remove `UnderscoreSupportingURI`.

Refactor `cask/cli` specs.

This occurs for any formulae that use relative `require` to files that
are inside of e.g. a tap to use abstract formulae.

Unshadow `allow_untrusted` option for pkg artifact

add available languages to cask info command

Add missing `summarize` method.

Fix `brew tests` leaving last file in trash.

The pkg stanza has an option called `allow_untrusted`, which is
supposed to cause `/usr/sbin/installer` to be called with the
`-allowUntrusted` switch.

PR #3141 seems to have renamed the `pkg_install_opts` field to
`options`. At the same time, it introduces an `options` parameter for
the `run_installer` method, which shadows the `options` getter
method, causing the `allow_untrusted` option to be silently ignored.

The issue affects just the `pkg` stanza because `Hbc::Artifact::Pkg`
is the only artifact class that has an `options` method.

This commit removes the shadowing by renaming the field to
`stanza_options`; in one case, it uses `_options` for a parameter
name (instead of the more canonical `_`) for the sake of clarity.

text_files: Skip the formula in .brew/formula.rb

Add audit warning if previous Cask version cannot be read.

travis.yml: avoid cloning Homebrew/homebrew-core.

Rearrange the test-bot clones so that the Homebrew/homebrew-core move
can be successful to avoid the later clone.

shims/super/make: don't export MAKE=make.

This is redundant and breaks Handbrake:
https://github.com/HandBrake/HandBrake/issues/872

pour_bottle?: Check bottle.compatible_cellar?

formula.bottled? is false when the bottle has no sha256,
as with a local bottle.

add language tests for dsl

add fixtures, tests for languages info output

add extra lines

Use `PATH` where possible.

brew: handle Ruby 2.3 more gracefully.

- `brew.rb` needed updated to fail unless on Ruby 2.3
- `brew update` should unset `HOMEBREW_RUBY_PATH` to ensure that this
  doesn't "stick" on a Ruby 2.0 version after a portable Ruby has been
  installed.

travis.yml: update Xcode version.

Support UN M.49 region codes.

audit: don't care about shadowing official taps.