absolute css asset loading (fixes #310)

[IstoraMandiri]

fixes #310 using webpack-contrib/css-loader#113

NPM tests passed, and it works in my project.

[KyleAMathews]

After some research, agree this looks like the right fix. One quick improvement though before I can merge — please wrap the / with the prefixLink helper so that this will work when people are building for Github Pages or other places where their absolute links aren't relative to the domain root.

Thanks!

[KyleAMathews]

Hrmm... playing with this a bit and staring at test failures I realized we can't use the prefixLink helper here as it tries to import the config.toml file which can only be done by Webpack not Node... sigh :-(

So I guess this will be a WTF for any poor sap who needs the publicPath set correctly on his CSS and is building a site with prefixed links. The main solution I see is moving config to a plain js module (which has other advantages as well namely being able to use logic for setting config + responding to env variables).

[KyleAMathews]

Published v0.11.4 with this PR, thanks!

[jlengstorf]

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