Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/models/primary-term.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Yoast\WP\SEO\Models;
+
+use Yoast\WP\Lib\Model;
+
+/**
+ * Primary Term model definition.
+ *
+ * @property int    $id       Identifier.
+ * @property int    $post_id  Post ID.
+ * @property int    $term_id  Term ID.
+ * @property string $taxonomy Taxonomy.
+ * @property int    $blog_id  Blog ID.
+ *
+ * @property string $created_at
+ * @property string $updated_at
+ */
+class Primary_Term extends Model {
+
+	/**
+	 * Whether nor this model uses timestamps.
+	 *
+	 * @var bool
+	 */
+	protected $uses_timestamps = true;
+
+	/**
+	 * Which columns contain int values.
+	 *
+	 * @var array
+	 */
+	protected $int_columns = [
+		'id',
+		'post_id',
+		'term_id',
+		'blog_id',
+	];
+}