Update grunt-csscomb.

less/.csscomb.json

 {
   "always-semicolon": true,
   "block-indent": 2,
-  "colon-space": [0, 1],
   "color-case": "lower",
   "color-shorthand": true,
-  "combinator-space": true,
   "element-case": "lower",
   "eof-newline": true,
   "leading-zero": false,
   "remove-empty-rulesets": true,
-  "rule-indent": 2,
-  "stick-brace": " ",
+  "space-after-colon": 1,
+  "space-after-combinator": 1,
+  "space-before-selector-delimiter": 0,
+  "space-between-declarations": "\n",
+  "space-after-opening-brace": "\n",
+  "space-before-closing-brace": "\n",
+  "space-before-colon": 0,
+  "space-before-combinator": 1,
+  "space-before-opening-brace": 1,
   "strip-spaces": true,
   "unitless-zero": true,
   "vendor-prefix-align": true,

package.json

@@ -47,7 +47,7 @@
     "grunt-contrib-qunit": "~0.5.2",
     "grunt-contrib-uglify": "~0.5.0",
     "grunt-contrib-watch": "~0.6.1",
-    "grunt-csscomb": "~2.0.1",
+    "grunt-csscomb": "~3.0.0",
     "grunt-exec": "~0.4.5",
     "grunt-html-validation": "~0.1.18",
     "grunt-jekyll": "~0.4.2",