Merge pull request microsoft#764 from Microsoft/prep37

Prep37

Merge pull request microsoft#732 from Microsoft/macos2async

Macos2async

minor fixes on building release

spelling

Fix to maze navigator

Merge branch 'master' of https://github.com/Microsoft/malmo

Merge pull request microsoft#558 from Microsoft/newMC

Update to newer version of Minecraft

Friday Fun: travelling salesperson contest sample.

Fixed string comparison bug

moving tag 0.20.0