relative path for csv_header_properties

[darkzbaron]

Hi there,

On windows, if you run the script from another working directory you get the following error:

IOError: [Errno 2] No such file or directory: 'csv_header_default.properties

This works however if you run the script from the script directory but this might deserve improvement.

[pe-st]

Thanks for reporting this oversight! The latest commit on the develop branch should fix this, can you please retest?