1. Previsou commit has wrong log message. So this is null commit
2. for correct log.

MFen:
1.9 -> 1.13 authors.ent
1.12 -> 1.15 hw/chapters.sgml

Submitted by: Yoshiaki Uchikawa <yoshiaki@kt.rim.or.jp>

		Kouki Higuchi <luke@kgc.co.jp>
		kuriyama

Reviewed by: kuriyama