Expose the creation of Reader/Writer

A quick and dirty hack to expose OpenCSV.

My need was to customize the creation of the OpenCSV writer/reader (different quote character, etc).

The proper solution would probably be to introduce some kind of CsvConfig/CsvSpec object that describes the format of the Csv we want to parse, but in the meanwhile, this hack does the work...

Pull-requesting in case you're interested in it. If not, you can just ignore it.