The default delimiter is changed to be "," instead of "` "

The expectation in xml2csv should be for comma-separated data - but the
default value set in the arguments is `, `. I have changed the default
to `,`.
Updated the sample CSV file to be comma-separated rather than comma-space separated
Merge pull request #10 from lorcan/master

xml2csv generates comma-separated CSV files rather than comma plus space CSV files by default