gulp-sass is distracted by the .css and .scss files in the distribution

[autopulous]

Bug, feature request, or proposal:

Proposal or this may just be a question (assuming that my ignorance can be dispelled)...

What is the desired behavior?

Separation of the .css and .scss files in the npm distribution

What is the current behavior?

events.js:160
      throw er; // Unhandled 'error' event
      ^
Error: src\framework\ui\style.scss
Error: It's not clear which file to import for '@import "default-theme"'.
       Candidates:
         _default-theme.scss
         _default-theme.css
       Please delete or rename all but one of these files.
        on line 1 of src/framework/ui/style.scss

What are the steps to reproduce?

Use 'gulp' + 'gulp-sass' to build an Angular2 application using Material2

What is the use-case or motivation for changing an existing behavior?

gulp-sass appears to have no way of ignoring the .css files when building a Material application

Which versions of Angular, Material, OS, browsers are affected?

2.0.0-alpha.6

Is there anything else we should know?

I once kissed a Libertarian and liked it...

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