Fix bug of initializing a field.
Merge branch 'master' into 190_init_bug

Conflicts:
	src/main/scala/net/aicomp/terraforming/entity/Field.scala
Fix Main to remove unused comment.
Merge pull request #206 from AI-comp/190_init_bug

フィールド初期化時に1プレイヤーで2つの工場を保有するバグを修正