fix: source map `sources` and `file` paths#753

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npetruzzelli wants to merge 12 commits intowebpack-contrib:masterfrom

npetruzzelli-forks:source-map-uris

Commits on Aug 3, 2018

Allow the user to opt out of legacy handling, but keep it as the default out of sensitivity to existing scripts that may expect this behavior.
npetruzzelli
committed
Address Lint errors and missing variable declaration.
npetruzzelli
committed

Commits on Aug 5, 2018

Remove optional support of legacy handling.
npetruzzelli
committed

Commits on Aug 13, 2018

Update assertions used in tests for source maps.
npetruzzelli
committed

Commits on Aug 24, 2018

Clean up `from` and `to` arguments for PostCSS processing.
npetruzzelli
committed

Commits on Nov 30, 2018