Return pure CSS instead of JavaScript

[jhnns]

The current sass-loader generates module.exports = '..css..'. This makes using the css-loader impossible because it will try to parse it as CSS.

According to @Sorka's guidelines a loader should do only one thing. I've adjusted the sass-loader to only transform the sass string to a css string. If you like to just retrieve a css string, you now need to use it in conjunction with the raw-loader:

var css = require("raw!sass!./file.scss");

I've also updated the README accordingly. The sass-loader now works exactly like the less-loader.

This is a breaking change and should receive at least a minor version bump (we're still in development, so it's ok not do a major version bump).

[jtangelder]

alright, i still have to fix #2, then i will release the next version.

[jhnns]

Ok thx 👍

[jtangelder]

Release it anyway, #2 might take a while...
it will be released under 0.1.0, since it's a breaking change.

[jhnns]

Cool, thx.