Change to add extra sass paths to the sass config instead of the assets config.
Merge pull request #3742 from ehelms/fixing-scss-pathing

Change to add extra sass paths to the sass config instead of the assets ...
fixes #4459 - allows proper rendering of pages using root_path
Merge pull request #3751 from thomasmckay/4459

fixes #4459 - allows proper rendering of pages using root_path