Enhance error message
Removed deprecated option from README
Convert all outstanding changes (yarn and package)
Adjusted NPM unit tests
Use spawn in any npm commands
Use spawn instead of exec
Fix unit test description
Do not swallow errors in case npm ls fails without a proper stdout
Unit tests
Added unit tests for copy modules packager flag
npm must copy modules
Fixed unit tests
Yarn does not need to copy modules to be fast
Install/prune unit tests. Fixed typo.
Copy lock file only if it can be read. AAdjust unit tests.
Copy lock file into function directories
Only stringify JSON or YML lock files
Fixed unit tests
Add basic Yarn functionality
Frank Schmid