Build: Updated grunt-sass to 0.18.1

Closes gh-57

Author: alexeiTruhin

package.json

@@ -58,7 +58,7 @@
     "grunt-git-authors": "2.0.0",
     "grunt-html": "1.6.0",
     "grunt-jscs": "0.6.2",
-    "grunt-sass": "0.17.0",
+    "grunt-sass": "0.18.1",
     "grunt-selenium-server": "0.1.2",
     "grunt-svgmin": "2.0.0",
     "grunt-svgstore": "0.5.0",