Fix Pivot table losing its connection.

This hopefully fixes #1198 and while it doesn't solve the underlying problem mentioned in #1429, it does the tackle the resulting mess. :)

laravel/database/eloquent/pivot.php

@@ -7,7 +7,14 @@ class Pivot extends Model {
 	 *
 	 * @var string
 	 */
-	public $pivot_table;
+	protected $pivot_table;
+
+	/**
+	 * The database connection used for this model.
+	 *
+	 * @var Laravel\Database\Connection
+	 */
+	protected $pivot_connection;
 
 	/**
 	 * Indicates if the model has update and creation timestamps.
@@ -26,7 +33,7 @@ class Pivot extends Model {
 	public function __construct($table, $connection = null)
 	{
 		$this->pivot_table = $table;
-		static::$connection = $connection;
+		$this->pivot_connection = $connection;
 
 		parent::__construct(array(), true);
 	}
@@ -41,4 +48,14 @@ class Pivot extends Model {
 		return $this->pivot_table;
 	}
 
+	/**
+	 * Get the connection used by the pivot table.
+	 *
+	 * @return string
+	 */
+	public function connection()
+	{
+		return $this->pivot_connection;
+	}
+
 }
\ No newline at end of file