update source-map
WINDOWS! update test fixtures
fix line bugs while concatenating a lot of files
Passing optional sourceRoot in options. See https://github.com/mozilla/source-map/#consuming-a-source-map
Convert slashes on relpath
Passing prefix in options
Revert "WINDOWS! update test fixtures"

This reverts commit 8a4a661f063755793e72172b06d2caab9eeb31aa.