Fixed #17320 -- Added whitespace validation to the Site.domain field
Fixed #19688 -- Allow model subclassing with a custom metaclass using six.with_metaclass
Merge pull request #828 from zerok/tickets/17320

Fixed #17320 -- Added whitespace validation to Site.domain field
Fixes #6412 - More details about template files.

Report more details about template files in loader postmortem.