readme.md
Merge branch 'master' of github.com:Champs-Libres/WikiPedale
add concepts to readme.md
add notification instructions
add some doc to class
README.md / concepts: some language and grammar
Merge branch 'master' of github.com:Champs-Libres/WikiPedale

Conflicts:
	README.md
README.md / add link to symfony doc about permissions