Allow non-js extensions

[thomasboyt]

This PR lets you set the extension for the path the jsx! filter looks for (personally, I use .jsx):

requirejs.config({
  // ...
  jsx: {
    extension: 'jsx'
  }
});

[pirelenito]

+1

[iamnoah]

+1, was about to submit the same thing.

[seiffert]

Thank you for your contribution! I'm no longer using this plugin actively, but I can merge this PR if you want!
If you have further ideas for improvement, you could also fork this repository and I'll put a deprecation notice into README with a link to your repository.

[pirelenito]

Hello everyone.

I've been using jsx-requirejs-plugin in my RequireJS setups. There is jsx file extension support via a configuration parameter (much like this pull request).

It is being actively developed, so it might be worth taking a look.

[mrienstra]

@seiffert, might as well update the README.md to mention that you are looking for a successor, and also direct folks towards philix/jsx-requirejs-plugin.

[murashki]

+1