add prettyDate helper

app/helpers/pretty-date.coffee

@@ -0,0 +1,7 @@
+`import { timeAgoInWords, safe } from 'travis/utils/helpers'`
+`import Ember from "ember"`
+
+helper = Ember.Handlebars.makeBoundHelper (value, options) ->
+  safe moment(value).format('MMMM D, YYYY H:mm:ss') || '-'
+
+`export default helper`

app/styles/app/layouts/caches.sass

@@ -31,4 +31,4 @@
       width: grid-calc(1, 13)
 
 .delete-repo-caches
-  margin-top: 1rem
+  margin-top: 1rem

app/templates/caches.hbs

@@ -15,7 +15,7 @@
             {{cache.branch}}
           </p>
 
-          <p class="tile-item caches-date column">{{cache.last_modified}}</p>
+          <p class="tile-item caches-date column">{{pretty-date cache.last_modified}}</p>
 
           <p class="tile-item caches-size column">{{mb cache.size}}MB</p>