add Category and Section models to Articles app
add management command to migrate Articles to Category FK
add management fields to Section model
merge caching branch
add typogrify
add typogrify filter for jinja
run article text blocks through typogrify
add typogrify to base templates
add typogrify to code templates
add typogrify to people and org templates
missed a spot
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
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