Undo renamed TLD cache file.

This is an internal file and shouldn’t matter, but I believe some ops teams are relying on this filename in 1.x. It’s free to change in 2.x.
Fix what was supposed to be testing an unlikely suffix.

It is now wholly owned, according to the PSL. See https://github.com/mozilla/mozilla-central/commit/a97e23bc2acab36ddaceb7b7f485ffd46f9d690f)

It’s gonna be an interesting future for this library, with arbitrary suffixes like this out there.
Update bundled snapshot
bump minor version
Really catch all upstream connection errors. Alleviate #47
Handle pkg_resources.resource_stream returning a cStringIO.StringI, which doesn’t define __exit__.
Now that Mozilla’s PSL SPOT is back, switch back to it primarily, but also allow a sequence of PSL URLs to try. #47

Update the GitHub mirror repo name: it is no longer mozilla-central, it is gecko-dev (and there was no redirect. D’oh).
bump patch version
Forgot to rb the cache file as well as wb

Fixes Python 3 unicode error
Fix deprecated argparse version keyword to __init__
Merge pull request #1 from john-kurkowski/master

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