A bunch of tweaks to the Users directory

- Move user directory from `/directory` to `/users/`
- Defaults to 'weekly' time period
- Don't include deleted topics/posts in the results
- Move heart icon to header instead of on each row
- "Users" instead of "Users found"

app/assets/javascripts/discourse/components/directory-toggle.js.es6

@@ -7,6 +7,12 @@ export default Ember.Component.extend(StringBuffer, {
   rerenderTriggers: ['order', 'asc'],
 
   renderString(buffer) {
+
+    const icon = this.get('icon');
+    if (icon) {
+      buffer.push(iconHTML(icon));
+    }
+
     const field = this.get('field');
     buffer.push(I18n.t('directory.' + field));