Add LDAP auth support

[xserna]

It would be great to have support for LDAP based authentication, similar as we previously have in eZP4, that can be setup to automatically place external users on corresponding user groups on login.

[Plopix]

I think @florianalexandre started something here: https://github.com/Novactive/NovaeZLdapAuthenticatorBundle can you tell us more @florianalexandre?

[erdnaxelaweb]

That's exactly what this bundle is aiming, re-introduce the old LDAP user login handler as an eZPlatform bundle.
Still a WIP but should be finished by the end of summer.

[lolautruche]

Thanks @Plopix @florianalexandre . I did a first review on Novactive/NovaeZLdapAuthenticatorBundle#1