Wrap font expression with #{} (#95)

see: #93

Wrap expression around `/` with `#{}`, to retain `/` as is.

http://sass-lang.com/documentation/file.SASS_REFERENCE.html#division-and-slash

Author: ciju

lib/sanitize.sass

@@ -205,7 +205,7 @@ svg
 	box-sizing: if(variable-exists(root-box-sizing), $root-box-sizing, border-box)
 	color: if(variable-exists(root-color), $root-color, #000000)
 	cursor: if(variable-exists(root-cursor), $root-cursor, default)
-	font: if(variable-exists(root-font-size), $root-font-size, 100%)/#{if(variable-exists(root-line-height), $root-line-height, 1.5)} if(variable-exists(root-font-family), $root-font-family, sans-serif)
+	font: #{if(variable-exists(root-font-size), $root-font-size, 100%)}/#{if(variable-exists(root-line-height), $root-line-height, 1.5)} if(variable-exists(root-font-family), $root-font-family, sans-serif)
 
 // specify the text decoration of anchors
 

lib/sanitize.scss

@@ -246,7 +246,7 @@ svg {
 	box-sizing: if(variable-exists(root-box-sizing), $root-box-sizing, border-box);
 	color: if(variable-exists(root-color), $root-color, #000000);
 	cursor: if(variable-exists(root-cursor), $root-cursor, default);
-	font: if(variable-exists(root-font-size), $root-font-size, 100%)/#{if(variable-exists(root-line-height), $root-line-height, 1.5)} if(variable-exists(root-font-family), $root-font-family, sans-serif);
+	font: #{if(variable-exists(root-font-size), $root-font-size, 100%)}/#{if(variable-exists(root-line-height), $root-line-height, 1.5)} if(variable-exists(root-font-family), $root-font-family, sans-serif);
 }
 
 // specify the text decoration of anchors