remove less-plugin-npm-import

Signed-off-by: Christopher Guindon <chris.guindon@eclipse-foundation.org>

package.json

@@ -17,7 +17,6 @@
     "grunt": "^1.0.2",
     "grunt-aglio": "^0.4.1",
     "grunt-contrib-connect": "^1.0.2",
-    "grunt-contrib-watch": "^1.0.0",
-    "less-plugin-npm-import": "^2.1.0"
+    "grunt-contrib-watch": "^1.0.0"
   }
 }