Make _escape_identifiers() public, so DB_forge can use it
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index 267c161..22ed047 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -436,7 +436,7 @@
 	 * @param	string
 	 * @return	string
 	 */
-	protected function _escape_identifiers($item)
+	public function _escape_identifiers($item)
 	{
 		if ($this->_escape_char == '')
 		{