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
Add sprint 23-27 release notes
Add EL7 information
New proxy configuration
Updating report processor configuration docs

Updating ENC docs
Update API v2 documentation and examples
Headline features and link redmine URLs
Update for 1.6 contributors
Add new configuration options
Merge branch '1.6-wip' into gh-pages