Modifying CSS RegEx to fix SVG fragment identifiers in font URIs

Fixes “url("/styles/fonts/icons.svg#icons") format("svg”);”

More info: http://www.w3.org/TR/SVG11/fonts.html#FontFaceURIElement
Merge pull request #340 from lukebussey/css-font-fix

Modifying CSS RegEx to fix SVG fragment identifiers in font URIs