v0.15.0
Update docs for new backported features from Py3.4
Merge branch 'master' into v0.14.x
Also expose HTTPMessage in ``future.moves.http.client``
install_aliases(): expose the full backported urllib modules instead of the Py2 aliases (issue #158)
Some additional Counter tests now work on Py2.6
Document `surrogateescape` support and enable it for bytes decoding (issue #116)
future.utils: add string_types etc. and clean up docs (issue #126)
Bump version to v0.15.0