add verdantimages app
implement on-the-fly creation of resized image renditions
methods to return url and img_tag from image Rendition instance
url conf to serve /media/images/ in debug mode
oops, fields.py really doesn't belong in the verdant project dir
add lead_image field to NewsItem (and teach South about RichTextField so that migrations can happen)
implement template tag for images
merge imagemanagement branch into master