Enable creating sites for active forening
Remove unused imports
Triple equals
Move domain verification logic to cms/page_util
Link to site setup page from no-site message
Enable changing the site domain
Remove unused import
Fix large-layout logo
Fix footer
Allow cross-site URLs TO the main site

On URL resolve failure, re-attempt it and specify the main urlconf to
resolve(). We need to monkeypatch Django's URLNode.resolve() method to
do that. I don't like monkeypatching, but this seems to be the lesser of
all evils. Feel free to reconsider solving this differently!
Include common URLs in small urlconf
Remove unused import
Handle missing advertisement
Make ads site-specific
Merge branch 'sites'