Fixes Varien_Io_Sftp::write, Varien_Db_Adapter_Pdo_Mysql::insertOnDuplicate

see bug 28404 on magentocommerce.com for Varien_Io_Sftp::write
Varien_Db_Adapter_Pdo_Mysql::insertOnDuplicate where using a Mysql keyword as a column name can cause an SQL syntax error