Improve attributes display consistency

Use the same color for extra attribute names than for existing ttl and
tags label. While here, remove extra colon after tags to match the other
labels.

Author: smortex

lib/riemann/dash/public/eventPane.js

@@ -17,7 +17,7 @@ var eventPane = (function() {
       '<pre class="description">{{-description}}</pre>');
 
   var rowTemplate =
-        _.template("<tr><td>{{-field}}</td><td>{{-value}}</td></tr>");
+        _.template('<tr><td class="field-name">{{-field}}</td><td>{{-value}}</td></tr>');
 
   // Hide the pane
   var hide = function() {

lib/riemann/dash/views/css.scss

@@ -167,7 +167,12 @@ html,table {
 
   .tags:before {
     color: $grey;
-    content: "tags: ";
+    content: "tags ";
+  }
+
+  .field-name {
+    color: $grey;
+    text-align: right;
   }
 
   .description {