add handling of multi-char delimiters in stream

[zippy]

currently we only handle \n as the new line delimiter. Also need to handle CR-LF...

[zippy]

ccf1abf adds arbitrary delimiter handling to streams.

Still to do is add this into the LINE_BY_LINE flag check of file streams. It'll work just fine for any delimiter that ends in \n (as does CRLF) but, it doesn't work for the general case.