Merge branch 'exercise_10_2' into chap10
Merge branch 'exercise_10_3' into chap10
Merge branch 'exercise_10_4' into chap10
Merge branch 'exercise_10_5' into chap10
Fix the problem that very long words break layout
by using the wrap helper.
Merge pull request #25 from Tacahilo/exercise_10_6

Exercise 10.5.6 レビューのお願い