Upgrade linter (version strings + file size limit)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "addons-server",
-  "version": "0.0.15",
+  "version": "0.0.16",
   "private": true,
   "engines": {
     "node": ">= 0.10.x",
@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "acorn": "0.4.0",
-    "addons-linter": "0.14.3",
+    "addons-linter": "0.15.0",
     "clean-css": "2.0.x",
     "less": "1.3.x",
     "stylus": "0.32.x",