css loaders fail to parse relative paths #730

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• I'm submitting a ...
  [x ] bug report
  [ ] feature request
  [ ] question about the decisions made in the repository
• Do you want to request a feature or report a bug?
  Report a bug
• What is the current behavior?
  requiring css in the styles Component attribute fails to concatenate base url to a relative url within that css file, instead concatenating './' and interrupting build process if the file isn't found.
• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via
  https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5).

Current project, Commit a4019da :

home.component.ts 24:3, change to:
styles: [ require('./home.style.css') ],

home.style.css, add:
:host {
background: url('assets/img/angular-logo.png');
}

run npm run start:hmr

• What is the expected behavior?
• base url should be concatenated to the relative url.
• build process should not be interrupted if the url isn't found
• What is the motivation / use case for changing the behavior?
  This behavior is not expected to break when all past versions of this repo supported it, and Angular's docs encourage it in the Webpack section.
• Please tell us about your environment:
• Angular version: 2.0.0-beta.rc.3
• Browser: [all ]
• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)

Switching back to raw-loader to handle css files solves this issue.