Moved the import for the change object.
Inhabitants now have materials, with each player having a different colour.
Added player field to GUI constructor.
Merge branch 'master' of git://github.com/FlorianOosterhof/tue-2io23
Added copying of a change.
Fixed wrong call of GUI constructor in GameRun class.
Merge pull request #19 from maikelsteneker/master

Material stuff, constructor changed.
Merge branch 'master' of git://github.com/FlorianOosterhof/tue-2io23