Optimized Bulk actions

- Updated SQL schema for every created_at column so that it has a default value
- Updated unit tests based on recent changes (new methods in SubscriberSegment model)
- Added check for HelpScout initialization code so that it doesn't throw errors

tests/unit/Models/SubscriberSegmentTest.php

@@ -223,7 +223,7 @@ class SubscriberSegmentTest extends MailPoetTest {
     expect($subscribed_segments[0]['name'])->equals($this->wp_segment->name);
   }
 
-  function testItCanDeleteSubscriptionToWPSegment() {
+  function testItCannotDeleteSubscriptionToWPSegment() {
     // subscribe to a segment and the WP segment
     $result = SubscriberSegment::subscribeToSegments($this->subscriber, array(
         $this->segment_1->id,
@@ -235,11 +235,10 @@ class SubscriberSegmentTest extends MailPoetTest {
     $result = SubscriberSegment::deleteSubscriptions($this->subscriber);
     expect($result)->true();
 
-    // it should have removed all subscriptions (even to the WP segment)
-    $subscriptions_count = SubscriberSegment::where(
-        'subscriber_id', $this->subscriber->id
-      )->count();
-    expect($subscriptions_count)->equals(0);
+    // the subscriber should still be subscribed to the WP segment
+    $subscribed_segments = $this->subscriber->segments()->findArray();
+    expect($subscribed_segments)->count(1);
+    expect($subscribed_segments[0]['name'])->equals($this->wp_segment->name);
   }
 
   function _after() {