[ja] Apply 51ba3fa4cc2fb203f8c377d5a937bf5f3425526d
[ja] Apply bc3f922f2549e44524dc11301d1e53c984b14a1b
[ja] Apply 21b4513573b8f6c810b57ec7a157c99d758e9ba3
[ja] Apply 7d11ee56e37975c33cc0646d72cb818db4d10666
[ja] Apply e329643b033f62df71dc545466ce80825840bf96
[ja] Apply 0c34253095f327209aceab8b3170f93b0c0c4ed9
Merge pull request #413 from harupong/ja-chapter3

[ja] Update chapter3
Merge branch 'progit/master' into ja