ffmpeg 2.4.2
ffmpeg: update 2.4.2 bottle.

Closes #32987.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libyaml: add a mirror.

Adds a mirror to the libyaml formula, and generally cleans up the
single/double quotes preference.

Closes #32986.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
rethinkdb 1.15.1
rethinkdb: update 1.15.1 bottle.

Closes #32985.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
jenkins 1.583

Closes #32981.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
scalastyle 0.5.0 (new formula)

Scalastyle is a style checker for Scala. They have a CLI interface and there
have been requests to make it available as a Homebrew formula:
  https://github.com/scalastyle/scalastyle-batch/issues/1

Here is such a formula. :)

Closes #32652.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>