Avoid duplicate portals while loading.

If multiple updates are interleaved, this.feed_html can be left with
duplicate entries.  Instead of building this.feed_html up bit by bit,
use the `portals` array to build it all at once.

scripts/feed.js

@@ -44,7 +44,7 @@ function Feed(feed_urls)
           online_ports_count += 1;
           entries = entries.concat(feed_entries);
           this.debounced_sort_refresh(entries);
-          r.portal.port_list_el.innerHTML = this.feed_html;
+          r.portal.port_list_el.innerHTML = this.get_feed_html();
         })
         .catch((e) => {
           console.warn(e);
@@ -58,26 +58,32 @@ function Feed(feed_urls)
     });
   }
 
-  this.get_feed = function(archive)
+  this.get_feed_html = function()
   {
-    this.feed_html = "";
+    var feed_html = "";
+    for(name in r.feed.portals){
+      console.log(name);
+      var portal = r.feed.portals[name];
+      var last_entry = portal.feed[portal.feed.length-1];
+      var is_active = Math.floor((new Date() - last_entry.timestamp) / 1000);
+      var rune = portal.port.indexOf(r.portal.data.dat) > -1 ? "@" : "~";
+
+      if(is_active > 190000 && portal.name != r.portal.data.name){
+        feed_html += "<ln title='"+(timeSince(last_entry.timestamp))+"' class='dead' data-operation='un"+portal.dat+"'>"+rune+""+portal.name+"</ln>";
+      }
+      else{
+        feed_html+= "<ln title='"+(timeSince(last_entry.timestamp))+"' class='"+(is_active < 150000 ? "active" : "inactive")+"'><a href='"+portal.dat+"'>"+rune+""+portal.name+"</a></ln>";
+      }
+    }
+    return feed_html;
+  }
 
+  this.get_feed = function(archive)
+  {
     return archive.readFile('portal.json')
       .then((portal_data) => {
         var portal = JSON.parse(portal_data);
-        var last_entry = portal.feed[portal.feed.length-1];
-        var is_active = Math.floor((new Date() - last_entry.timestamp) / 1000);
-        var rune = portal.port.indexOf(r.portal.data.dat) > -1 ? "@" : "~";
-
-        if(is_active > 190000 && portal.name != r.portal.data.name){
-          this.feed_html += "<ln title='"+(timeSince(last_entry.timestamp))+"' class='dead' data-operation='un"+archive.gateway+"'>"+rune+""+portal.name+"</ln>";
-        }
-        else{
-          this.feed_html+= "<ln title='"+(timeSince(last_entry.timestamp))+"' class='"+(is_active < 150000 ? "active" : "inactive")+"'><a href='"+portal.dat+"'>"+rune+""+portal.name+"</a></ln>";
-        }
-
         this.portals[portal.name] = portal;
-
         return portal.feed
           .filter((entry) => {
             if (!this.filter) return true;