Include selected local subdirs in baseline-accept

[pcj]

Working on #13217, was not able to get a transpile to test to accept, solved in response to @RyanCavanaugh #13217 (comment).

This PR is quick and dirty. It may be sufficient as-is, or may elicit a discussion re: a more elegant way to do this... Should it just be a completely recursive solution (search all subdirs), or are only selected folders intended to be named in $ jake baseline-accept?

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[RyanCavanaugh]

Please update the gulpfile as well - they need to do the same thing. (And please don't ask why we have two build files to do the same thing 😢 )

[mhegazy]

should we just drop the gulp file?

[RyanCavanaugh]

I would vote for getting rid of the jakefile, or at the very least turning all the jake targets into aliases for the gulp targets. Having two implementations is getting old.

[pcj]

Kind of funny you each proposed getting rid of the opposite file 😄. So which one are people using? I went with jake as this was part of the instructions in the CONTRIBUTING.md, but I have no preference (It was the first time I had encountered this particular build tool).

If you have a consensus, I'd be happy to delete that file and update the documentation.

[mhegazy]

I still use jake. just muscle memory though. gulp seems fine, my only concern is that it is slower.

[mhegazy]

should be covered by the change in abae1bd