remove Erwann Mest from Paris.js members

Mr. Mest has nothing to do here. Other suggested changes (not up to me to chose) could be :
 - remove the Paris.js list members, since there is no official members in Paris.js
 - explicitly write that "Paris.js est auto-organisé via la mailing-list"
 
see also https://groups.google.com/forum/#!topic/francejs/2yD3BfEi8dQ