Remove classList in favor of ids

Ancient webkit doesn't support classList on SVGElement
Merge branch 'classlist'
Port fonts.css to sass
Untrack generated css files
Default puzzle dimensions
Merge branch 'master' of https://github.com/mcamac/crosswords
Merge branch 'ui-fixes'
Add filled squares to SVG
Split setSquare into private methods
Refactor clue list vue with computed properties
Merge branch 'vues-clues'
Merge branch 'filled-squares'