Allow pug file extensions in html-resource-plugin

[qraynaud]

I'm using pug & webpack and found out that

<require from="resources/elements/simple-component.pug"></require>

was not working.

After looking into the codebase I found out that this seems to fix the issue though I'm not sure it's the proper way to do this.

Ideally I would have loved to find a way to make this configurable in main.js and even the webpack aurelia plugin viewExtensions option to be included in environment and looked for by the generated main.js file. Maybe with something like :

export function configure(aurelia) {
  aurelia.use
    .standardConfiguration()
    .plugin(PLATFORM.moduleName('aurelia-validation'))
    .plugin(PLATFORM.moduleName('aurelia-animator-css'))
    .feature(PLATFORM.moduleName('resources/index'))
  ;

  if (environment.viewExtensions) {
    aurelia.setViewExtensions(environment.viewExtensions);
  }
}

But it's too big a change for me at this point. And I think it would have impacts cross repositories so it's better to get things done by smaller steps I suppose.

Hope this helps!

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[qraynaud]

I rebased my PR hoping it would fix the tests failing. I'm glad it did ;)

If you need me to improve my code over this, I'll be glad to do so. Just point me in the right direction and I'll do it.

I have been running this patch in production for over a month and it seems stable enough. I hope this helps.