Fix find_distributions with non-empty context

[kulikjak]

find_distributions now honors name parameter from the original context.

Closes #211.

[pradyunsg]

Would it be possible to add a test for this, to help ensure we don't regress on this behaviour in the future?

[kulikjak]

Sure, I added a new test (and found a problem in existing one - there was a typo in _test_bootstrap-0.0.1.dist-info).

I didn't have much time to look into it up until today, so it took a little longer; sorry about that.

[kulikjak]

Small update: I now tested the patched version with build of ~120 different Python packages and everything seems to work as expected.

[davidt]

Is there any ETA on this? I'm hitting this with the build of one of our packages, and the proposed fix works for me.

[takluyver]

I'll merge this, but I'd like to sort out the questions about warnings (#157) before making a release, to avoid making anything worse.

[takluyver]

Thanks @kulikjak !