MediaStorage does not respect the read_mode parameter

[jbradberry]

Which is a problem if one needs to deal with files by using universal newlines mode, for example.

[bmihelac]

Thanks for reporting. Would you like to submit a PR?

[jbradberry]

I started on one, but found that the obvious change broke tests elsewhere.

[bmihelac]

That is really frustrating :( If you open PR with broken tests I would be glad to take a look and fix tests in the next days.

[jbradberry]

It appears that I misremembered, the broken test I was seeing (core.tests.base_formats_tests.CSVTest.test_import_unicode) happens on my system regardless of whether I've made changes or not.

[bmihelac]

Merged, thanks a lot! Would you be kind to open an issue with stacktrace for broken tests with python and tablib versions.