Row separators should be escaped by double-quoting the entire field, not by backslash-escaping the row separator

No CSV specification escapes fields like in this test https://github.com/evan/ccsv/blob/master/spec/ccsv_spec.rb#L111

Similarly, column separators are not escaped with backslashes, but by using double-quoting https://github.com/evan/ccsv/blob/master/spec/ccsv_spec.rb#L76
