External Authentication up-to-date.
Backwards compatibility with original links.
Merge pull request #216 from adelton/external-authentication

External Authentication up-to-date.
Copy 1.5 to 1.6
Rename 1.5 to 1.6
Wipe 1.5 release notes
Extending the External Authentication with the Foreman 1.6 features, updating attributes upon every logon and support for external group mapping.
No need of rpmnew copy anymore