Add less npm package

package.json

@@ -22,19 +22,20 @@
     "webchat"
   ],
   "author": "JC Brand",
-  "license": "MIT",
+  "license": "MPL",
   "bugs": {
     "url": "https://github.com/jcbrand/converse.js/issues"
   },
   "devDependencies": {
-    "grunt-cli": "~0.1.13",
+    "bower": "latest",
     "grunt": "~0.4.4",
+    "grunt-cli": "~0.1.13",
+    "grunt-contrib-cssmin": "~0.9.0",
     "grunt-contrib-jshint": "~0.10.0",
-    "phantom-jasmine": "0.1.8",
-    "phantomjs": "~1.9.7-1",
-    "bower": "latest",
     "grunt-contrib-requirejs": "~0.4.3",
-    "grunt-contrib-cssmin": "~0.9.0"
+    "less": "~1.7.0",
+    "phantom-jasmine": "0.1.8",
+    "phantomjs": "~1.9.7-1"
   },
   "dependencies": {
     "requirejs": "~2.1.11"