SASS: Support a compass_config

[mrjoelkemp]

From #103

Along this line for those using bower/compass like I do there i have @imports that reference paths in the config.rb used by bower.

So for example if look at my _packages.scss 
https://github.com/dkebler/hugo-quickstart-site/blob/master/framework/scss/vendors/_packages.scss
you will see no path in the imports there because compass looks for those paths in its config.rb.

So your package to to be useful in the sense of being able to follow a sass dependency into an "external" package (outside the root) you'd have to parse the config.rb file.
https://github.com/dkebler/hugo-quickstart-site/blob/master/framework/config.rb
for those paths to see if the dependency is there before saying it's not found.

I guess that would mean another setting which would be path to compass config.rb file. If set then you'd know the person was using compass.

I don't use grunt or other sass compilers but I imagine it's a similar issue.

Associated links:

• Sample config.rb: https://github.com/dkebler/hugo-quickstart-site/blob/master/framework/config.rb
• Sass file using aliased paths: https://github.com/dkebler/hugo-quickstart-site/blob/master/framework/scss/vendors/_packages.scss
• 3rd party package paths: https://github.com/dkebler/hugo-quickstart-site/tree/master/framework/packages

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