Prevent from grouping by extension

[benweet]

This example taken from the README.md didn't work:

gulp.src('./bower.json')
  .pipe(inject(gulp.src(['./dist/app.min.js', './dist/app.min.css'], {read: false}), {
    starttag: '"main": [',
    endtag: ']',
    transform: function (filepath, file, i, length) {
      return '  "' + filepath + '"' + (i + 1 < length ? ',' : '');
    }
  }))
  .pipe(gulp.dest('./'));

It would only inject app.min.css since the injection of the CSS overwrites the injection of the JS.

I've added ignoreExtensions option to make it possible to inject all files regardless of their extension (could be useful in many situations I think).

[joakimbeng]

Hi, this is actually a regression bug. A new option is not necessary, the code should group files by starttag instead of extension. So I wont merge this..