Allow recordings to be 'unlisted'

Unlisted is a state between published and unpublished. They are still
published in the server, but will not appear to anyone other than the
user that created the recording.
It is done using a metadata attribute and required several changes in how
the application handles publishing and unpublishing.

app/assets/stylesheets/landing.scss

@@ -86,3 +86,17 @@
     }
   }
 }
+
+.recording-update-trigger {
+  &.recording-inaccessible {
+    color: red;
+  }
+
+  &.recording-unlisted {
+    color: #e3a91e;
+  }
+
+  &.recording-published {
+    color: green;
+  }
+}

app/assets/stylesheets/shared.scss

@@ -106,3 +106,7 @@ html, body {
     text-align: center;
   }
 }
+
+.popover {
+  max-width: none;
+}