Add basic support for node status by using the most recent report

The following frontend features are implemented
- Number of failures, successes, noops/skips in overview
- Show latest reports with 1 or more events in overview
- Direct links to latest Report
- Number and types of events in nodes list

puppetboard/static/css/puppetboard.css

@@ -52,3 +52,16 @@ th.headerSortDown:after {
 .table tbody tr.error>td {
   background-color: #f2dede;
 }
+h1.error {
+  color: rgb(223, 46, 27);
+}
+h1.success {
+  color: #18BC9C;
+}
+h1.noop {
+  color:#aaa;
+}
+.numtag {
+  width:20px;
+  text-align:center;
+}

puppetboard/static/js/tables.js

@@ -8,11 +8,11 @@
 
   $('.nodes').tablesorter({
     headers: {
-      3: {
+      4: {
         sorter: false
       }
     },
-    sortList: [[0, 0]]
+    sortList: [[1, 0]]
   });
 
   $('.facts').tablesorter({