Rename the world and edit the template to match with the mission.
Fix some typos found in the lesson about mazes.
Merge pull request #264 from oster/fix-typos-maze

Fix some typos found in the lesson about mazes.
warnings--
Fix #255 and add entry into the ChangeLog file
Merge pull request #260 from oster/fix-mission-IndexOfValue

Rename the world and edit the template to match with the mission.
Merge branch 'master' into fix-template-maze
Fix #246 fix #259