Module for removing non-critical font face rules

Splitting out this small module out of the core js file,
meaning testing time drops to 0, and will never break unless
this file is tested.
Check standaloneMode once
Merge pull request #30 from pocketjoso/modularize-rm-unused-fontface

Module for removing non-critical font face rules
module for css preformatting
rm verbose comment
add simple css preformatter test
rm generated css files from full test