Constrain stylus @import processing to styl files
Constrain stylus @import processing to styl files

Ensure that only .styl files get processed for @import statements, so
that stylus can more peacefully co-exist with SASS in the same asset
environment.

claudetech/ruby-stylus,forgecrafted/ruby-stylus,claudetech/ruby-stylus,forgecrafted/ruby-stylus