Tutorial: add section on how to use Eliom_output.Customize
Tutorial: add section on how to use Eliom_output.Customize

Ignore-this: 87d697c55620f60c1177f8d68fff4ae

darcs-hash:20110131152904-0cb73-b9c886617440c6be4eba7f4b339cc6e5e5be74c9

mfp/ocsigenserver,mfp/ocsigenserver