GoalCreateに値未入力時エラー処理
Merge branch 'branches-timer' of https://github.com/s4shiki/GoalSupporter into branches-timer

Conflicts:
	bin/GoalSupporter.apk
	bin/classes.dex
	bin/classes/com/example/goalsupporter/GoalCreate.class
	bin/classes/com/example/goalsupporter/TimerActivity.class
	bin/classes/com/example/goalsupporter/TimerCountDownTimer.class
	src/com/example/goalsupporter/GoalCreate.java