[nl] All chapters - Add header and SHA-1 of current HEAD

	Added SHA-1 of current head to be used in future to
	allow for easier (hopefully) comparison of changes in
	en - original texts.
Merge pull request #689 from Cpt-xx/synchVersions

[nl] All chapters - Add header and SHA-1 of current HEAD
[zh] Update Chapter 5
Merge pull request #690 from biluncloud/master

[zh] Update Chapter 5