findClient(Class class) return the class  by autocasting
update README
update README
update README
update README
update README
[maven-release-plugin] prepare release pac4j-1.5.1
[maven-release-plugin] prepare for next development iteration
update to 1.6.0-SNAPSHOT
add new YahooOpenIdClient
Change version to 1.6.0 and update README
Allow to subclass Client

Allow to subclass a client like FormClient, but get the client as it with :
Clients.findClient(FormClient.class);