Bump HumanizeDuration requirement to 2.8.0

Author: evilaliv3

bower.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "angular": ">= 1.0.7",
     "momentjs": "~2.9.0",
-    "humanize-duration": "~2.4.0"
+    "humanize-duration": "~2.8.0"
   },
   "devDependencies": {
     "bootstrap": "2.3.2",