Install,uninstall, update node modules

- Update grunt, grunt-contrib-clean, grunt-contrib-requirejs, grunt-contrib-watch, lodash
- Install autoprefixer, cssnano, grunt-postcss, grunt-sass, node-sass
- Uninstall grunt-contrib-less, less-plugin-autoprefix, less-plugin-clean-css

package.json

@@ -4,17 +4,19 @@
   "description": "A web application for searching UNL websites via Google Custom Search.",
   "dependencies": {},
   "devDependencies": {
-    "grunt": "^0.4.5",
-    "grunt-contrib-clean": "^0.6.0",
-    "grunt-contrib-less": "^1.0.1",
-    "grunt-contrib-requirejs": "^0.4.4",
+    "autoprefixer": "^9.1.1",
+    "cssnano": "^4.0.5",
+    "grunt": "^1.0.3",
+    "grunt-contrib-clean": "^1.1.0",
+    "grunt-contrib-requirejs": "^1.0.0",
     "grunt-contrib-uglify": "^0.9.2",
-    "grunt-contrib-watch": "^0.6.1",
+    "grunt-contrib-watch": "^1.1.0",
     "grunt-curl": "^2.2.0",
-    "less-plugin-autoprefix": "^1.4.2",
-    "less-plugin-clean-css": "^1.5.1",
+    "grunt-postcss": "^0.9.0",
+    "grunt-sass": "^3.0.1",
     "load-grunt-tasks": "^3.2.0",
-    "lodash": "^3.10.1"
+    "lodash": "^3.10.1",
+    "node-sass": "^4.9.3"
   },
   "scripts": {},
   "repository": {