Update What's New doc to mention that issue #141 is fixed in v0.16.0

Merge branch 'v0.15.x'

Merge branch 'v0.15.x' and tag 'v0.15.1'

Bump version to v0.15.0

Merge branch 'master' of https://github.com/PythonCharmers/python-future

Update What's New doc for v0.14.2

Bump version to v0.14.1

Bump version to v0.14

Tweak urllib test again

Bump version to v0.13.0 final