added support for universal newlines to csv

What i did here was specify 'U' mode for reading the csv.  It worked for my particular situation, but i don't know if there are any further implications.  Not sure if this implementation is compatible with other file backends, for example, or whether there is a more elegant solution.  In the latest development branch of Django, it appears that universal newline support is supported by default, although i don't have the reference.