Fix #408: Reject invalid strings when parsing numbers
Merge pull request #480 from gzm0/parse-float

Fix #408: Reject invalid strings when parsing Double and Float
Fix #481: Fix relativize to also work with non-prefix bases
Fix #478: Make optimize tasks honor relativeSourceMaps
Fix #482: Source map patchings for scalajs-corejslib.js
Merge pull request #483 from gzm0/relative-source-maps

Relative source maps