Add the ability add paths to stylus compiler

[destos]

I need to import stylus files that are outside the brunch config folder but am running into some issues.

My use case is a bunch of individual apps that will share stylus styles that need to be individually built and would like to avoid stylus includes like @import '../../../stylus/forms'.

I figured one would need to use stylus().set('paths', paths) per the stylus docs, and attempted this:

  compile: (data, path, callback) =>
    stylus(data)
      .set('compress', no)
      .set('firebug', !!@config.stylus?.firebug)
      .set('paths', @config.stylus?.paths)
      .include(sysPath.join @config.paths.root)
      .include(sysPath.dirname path)
      .use(nib())
      .render(callback)

Which would look something like stylus.paths: [ '/my/absolude/imaginary/path/stylus']in the config.coffee

However didn't have much luck.

[paulmillr]

it should work. how about using include for each config.stylus.paths?

[destos]

This appears to have added the functionality I need: 6d59081d25825949dc6ba64611c40d4d31cd4c87

Let me know if you want me to write tests before a pull request.

[paulmillr]

yep, tests would be nice