copie de TP
new model for authors
test author page
authors controller
create user
show author page
fix authors test
show authors list on user profile
publication model, commence avec les tests

fix small typos
function to create new publication, show + tests

further author and user tests
all tests pass
require publication list on author page
petit amelioration
tests for add, edit links
links for add publication, ..
fix, add tests
nouveau champs pour publication, authors tests
create and show with new attributes
fix test
test for edit publication