add Site.root_url method
maintain a cached mapping of site root paths to root urls
Add new implementation of page.url / page.relative_url using url_path
prefetch url_path in upcoming_events query
remove redundant 'if there are things to loop over then loop over them' logic from sidebar adverts
homepage has no get_related_news method, so remove showRelatedNews (which would always fail) from its sidebar
move sidebar related news into its own include
fix internal link urls on ads
Merge branch 'feature/urlcache' into develop
Merge branch 'develop' of github.com:torchbox/verdant-rca into develop