[ #6 ] update build.sbt
Merge branch 'feature/issue/6' into develop
[ #7 ] Cluster(Block Tileの集合)の実装
[ #7 ] Clusterをベースに迷路生成するアルゴリズムを実装
Merge branch 'feature/issue/7' into develop
Merge branch 'develop' into feature/issue/4
[ #8 ] RichLabyrinth.targetSize関数を追加
Merge branch 'feature/issue/8' into develop
Merge branch 'develop' into feature/issue/4