refactoring. added redis drivers.

laravel/database/manager.php

@@ -17,8 +17,6 @@ class Manager {
 	 *
 	 * If no database name is specified, the default connection will be returned.
 	 *
-	 * Note: Database connections are managed as singletons.
-	 *
 	 * <code>
 	 *		// Get the default database connection for the application
 	 *		$connection = DB::connection();

laravel/database/query.php

@@ -611,7 +611,9 @@ class Query {
 	 */
 	protected function adjust($column, $amount, $operator)
 	{
-		return $this->update(array($column => Manager::raw($this->grammar->wrap($column).$operator.$amount)));
+		$value = Manager::raw($this->grammar->wrap($column).$operator.$amount);
+
+		return $this->update(array($column => $value));
 	}
 
 	/**