We demonstrate:
 - A previously defined route can not be overwritten
 - That public routes are applied after private routes, thus if a private
  route is already defined, the public route is ignored.

Note that route injection was revisited on this occasion:
 - Make WebAdmin server responsible of private/public triage. This avoids
 errors like the one with SwaggerRoutes where the developer forgets to
 declare his route as public upon injections. This also factorize the code
 between code & test (as a user might want to define custom public routes as
 well)

…ensions