Pix_Table bulkinsert support

SomeTable::bulkInsert(array('key1', 'key2', 'key3'), array(
    array('value1-1', 'value1-2', 'value1-3'),
    array('value2-1', 'value2-2', 'value2-3'),
    array('value3-1', 'value3-2', 'value3-3'),
));