UI改善、ヘルプ追加
UI改善
Merge remote-tracking branch 'origin/master' into HEAD

Conflicts:
	pom.xml
	src/main/resources/org/jenkinsci/plugins/stepcounter/StepCounterProjectAction/jobMain.jelly
	src/main/resources/org/jenkinsci/plugins/stepcounter/StepCounterProjectAction/summary.jelly
	src/main/resources/org/jenkinsci/plugins/stepcounter/StepCounterSetting/config_ja.properties