Merge remote-tracking branch 'origin/develop_refactering' into
develop_refactering

Conflicts:
	src/main/java/jp/level_five/freshers/k_means/KMeans.java
	src/main/java/jp/level_five/freshers/k_means/KMeansData.java
Merge remote-tracking branch 'origin/develop_refactering_merge' into develop_refactering