On Python 3 sys.stdout will accept Unicode by default.
Tests demonstrating writing to unicode files.
Support files that accept Unicode, on Python 3.
News entry for Unicode file fix.
Merge remote-tracking branch 'refs/remotes/origin/master' into unicode-files-135
Address review comment: ujson usage should now be covered by one of the tox test environments.
Address review comment: Mention Python 2.
Address review comment: Make _FileDestination less private, since it
crosses module boundaries.
Address review comment: Explain 5 second wait.
Address review comment: Clarify tests.
Merge pull request #139 from ClusterHQ/unicode-files-135

Make Unicode files work.

Fixes #135.