feat: support source maps (rewriting stack traces)
feat: support source maps (rewriting stack traces)

https://github.com/karma-runner/karma/commit/70e4abd9b8db6b05de557ca6e9204339a21be06b

looker/karma-coffee-preprocessor,paolocarrasco/karma-coffee-preprocessor,karma-runner/karma-coffee-preprocessor,crabhi/karma-empty-css-preprocessor,michael-brade/karma-livescript-preprocessor