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

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

Documented lua dependency on luasocket for build instructions.

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

Merge pull request microsoft#253 from Microsoft/aleRewardTime

Circumnavigated costly xml wrangling

Put release date for 0.16.0 into the changelog.

Minor: adding 0.15.0 release date