Add configuration for line ending character(s)

[philrowan]

I am in need of using UNIX style line endings in my files. Expecially as .net is opening and running on MAC and Linux systems now it seems good to be able to configure this in general. I would like to add this to the CsvFileDescription and then in CsvStream change line 71 from

        m_outStream.WriteLine("");

to

        m_outStream.WriteLine(m_endOfLineChar);

and pass this end of line char in from the file descriptor