WP Users list

- refactored and fixed listing issues (related to Segments)
- removed bulk actions from segments
- added synchronize methods for WP users
- Update action in segments only for WP Users list
- added "type" column to segments (default, wp_users, dynamic...)
- added "status" column to subscriber_segment table (useful soon)

lib/Models/Segment.php

@@ -77,7 +77,20 @@ class Segment extends Model {
   }
 
   static function getWPUsers() {
-    return self::findOne(1);
+    $segment = self::where('type', 'wp_users')->findOne();
+
+    if($segment === false) {
+      // create the wp users list
+      $segment = self::create();
+      $segment->hydrate(array(
+        'name' => __('WordPress Users'),
+        'type' => 'wp_users'
+      ));
+      $segment->save();
+      return self::findOne($segment->id());
+    }
+
+    return $segment;
   }
 
   static function search($orm, $search = '') {