Merge branch 'staging' of github.com:laravel/laravel into staging

laravel/database/eloquent/relationships/belongs_to.php

@@ -65,7 +65,10 @@ class Belongs_To extends Relationship {
 		// are looking for the parent of a child model in this relationship.
 		foreach ($results as $result)
 		{
-			$keys[] = $result->{$this->foreign_key()};
+			if ( ! is_null($key = $result->{$this->foreign_key()}))
+			{
+				$keys[] = $key;
+			}
 		}
 
 		$this->table->where_in($this->model->key(), array_unique($keys));

laravel/helpers.php

@@ -26,6 +26,17 @@ function __($key, $replacements = array(), $language = null)
 	return Laravel\Lang::line($key, $replacements, $language);
 }
 
+/**
+ * Dump the given value and kill the script.
+ *
+ * @param  mixed  $value
+ * @return void
+ */
+function dd($value)
+{
+	die(var_dump($value));
+}
+
 /**
  * Get an item from an array using "dot" notation.
  *