Added default value of RendererSettings.preRenderTime to JSDoc.
Added RendererSettings.preciseOutlines

When false, outlines are rendered in increments of the gaussian blur (if any). Vastly boosts performance for large-outline-large-blur lines and doesn't look appreciably different.
Revert "Work around build break because of source-map 0.1.35"

This reverts commit 54b424548293ef35339e24cc9a6665c8a168c096.

Fixed in source-map 0.1.37.