[WIP/dont merge] add include option

[tyler-dot-earth]

What:

Adds include option so the plugin only hits. Works like exclude, but the opposite.

Why:

Been structuring my CSS Modules files like foo.module.css lately and wanted this option. Exclude didn't work for me (similar to this comment).

Related issues:

• How to Ignore Third Party Component css files while using babel-plugin-react-css-modules #98

[tyler-dot-earth]

Note: still trying to test this in my own project (ReferenceError: Unknown plugin "react-css-modules" specified when trying to use my own branch via "babel-plugin-react-css-modules": "github:tsnieman/babel-plugin-react-css-modules.git#include-options", in package.json), but the tests seem to work fine when I npm run test. Tested locally but still encountering a "can't use multiple anonymous" error.

@gajus (or other maintainers) if you have any suggestions about why this is a bad idea/implementation/etc, lemme know and I'll fix it as best I can!

[tyler-dot-earth]

Turns out there's already a similar/duplicate PR #106.

[tyler-dot-earth]

still encountering a "can't use multiple anonymous" error.

Wasn't caught by tests because tests apparently work differently than the plugin in actual use. Noticed that src/getClassName.js's .length behaves differently in actual use versus npm run test. Need to fix some additional logic apparently.

[tyler-dot-earth]

lmfao i made all kinds of typos in this. closing. will reopen when it's sensible and i'm not distracted doing 15 things.