Auto merge of rust-lang#434 - Amanieu:release-0.14.0, r=Amanieu

Prepare release of v0.14.0

See the changelog for highlights.

Version 0.13.2

Version 0.13.1

Version 0.12.3

Version 0.12.2

Version 0.12.1

Version 0.12.0

Version 0.11.2

Version 0.11.1

Version 0.11.0