add django_pluralize template filter
add author bios to article detail page
fix id attr for bio h3s
size twitter avatar img to normal 48px
fix author box p in case of one-line bio
Merge branch 'authors' into caching
add view to trigger cache clear for path
add homepage cache clear link to admin
add same-origin ajax handling
add ajaxy cache clear link to admin index
remove auto homepage cache clear from article, code saves