[Development Practice] Contributor's recognition

[Vincent Massol]

Hi committers,

We've already discussed this before but I've seen that we're not all  
following this (even though we agreed to do it on this list).
I have now put it in http://www.xwiki.org/xwiki/bin/view/Community/ 
DevelopmentPractices#HApplyingacontributor27spatch

The idea is to give proper recognition to contributors by:

1) Naming them using the specified commit log template
2) Adding them on the contributor's page on xwiki.org

It would be nice if all committers could follow this and help each  
other follow it (I know I'm also forgetting it from time to time).

Thanks
-Vincent