pass through sourceMap option to stylus, and also inherit source-map option from devtool
pass through sourceMap option to stylus, and also inherit source-map option from devtool

walmartlabs/stylus-relative-loader,jordansexton/stylus-loader,jordansexton/stylus-loader,actano/stylus-loader,mzgoddard/stylus-loader,actano/stylus-loader,shama/stylus-loader,mzgoddard/stylus-loader,shama/stylus-loader,walmartlabs/stylus-relative-loader