Update optimer and fleetup javascript (#695)

* Split out moment duration formatter

* Replace fleetup timer js

* Replace optimer js

* Remove obsolete countdown.js library

* Remove unused dateformat.js references

* Remove obsolete dateformat library

stock/templates/registered/timermanagement.html

@@ -431,6 +431,7 @@
     </div>
 
     {% include 'bundles/moment-js.html' with locale=True %}
+    <script src="{% static 'js/timers.js' %}"></script>
     <script type="text/javascript">
         var locale = "{{ LANGUAGE_CODE }}";
 
@@ -490,22 +491,6 @@
             }
         }
 
-        /**
-        * Get a duration string like countdown.js
-        * e.g. "1y 2d 3h 4m 5s"
-        * @param duration moment.duration
-        */
-        function getDurationString(duration) {
-            var out = "";
-            if (duration.years()) {
-                out += duration.years() + 'y ';
-            }
-            if (duration.days()) {
-                out += duration.days() + 'd ';
-            }
-            return out + duration.hours() + "h " + duration.minutes() + "m " + duration.seconds() + "s";
-        }
-
         /**
          * Set all local time fields
          */