Merge branch 'master' into 'submit-09'

# Conflicts:
#   README.md
#   src/main/java/cz/muni/fi/pb162/project/demo/Draw.java
#   src/main/java/cz/muni/fi/pb162/project/geometry/Polygon.java
#   src/test/java/cz/muni/fi/pb162/project/geometry/LabeledPolygonTest.java