fixes #1509 - Foreman should use the proxy to import puppet classes

fixes #1324 - Separate permssions on hosts from permissions for objects within hosts.

This allows a user to be granted permission to edit the host (and so change the group or proxy) but not, for example, edit the parameters
This could probably be extended further if necessary.

fixes #1456 - renaming the admin account should not be allowed

fixes #1175 - PXELinux does not render with spoof

fixes a couple of broken tests + show full error trace in development mode.

fixes #1392 - change root password back to system wide defaults

fixes #1446 - expire idle web sessions

fixes #1281 - assingn more than one domains to a subnet

fixes #1313 ensure all host names are lowercased

Signed-off-by: Florian Koch <florian.koch1981@googlemail.com>

fixes #1421 - expose subnet ranges for automatic IP address allocations