Add anticheck for not detecting TLA in injected code

[perbergland]

Adding specific check for #11 so that the await visitor ignores reify’s own injected code.

Also fixing run.sh to use npx (picking up mocha from node_modules instead of an expected global install) and adding support for MOCHA_GREP for quicker local development.

Added a unit test, the bug only happens when reify is used via the babel plugin wrapper.

[perbergland]

@zodern if you have any ideas on how to write a unit test in this repo that can reproduce the issue, that would be great. I don’t understand the real root cause yet.

Update: no need, I figured it out

[perbergland]

I understand the code better now and added a unit tests in the test/babel-plugin-tests.js file.

The code that inserts the await reifyWaitForDeps() is run in the "enter" phase of the plugin and the TLA detection happens later, in the "exit" phase so the code change is not just a hack but a bona fide check that needs to be there.