CsvFileSource cannot handle gzip files

[ivarg]

Hi, and thanks very much for this library.

I noticed that when trying to feed the CsvFileSource a gzip file, I got this error:

TypeError: argument 1 must be an iterator

After some digging I found out that csv.reader() expects an iterator, which, unfortunately, is not what self.open_file() returns (see FileBasedSource).

This test exposes the problem, and this addition to sources.py fixed my problem.

[pabloem]

Hi!
Thanks for filing the issue. Would you like to submit a pull request with the change so I can pull it in?

[ivarg]

Sure, I'll do that.