models.py: add Image model
models.py: add url interface for Image
+ views.py: add upload image interface
+ html: add blog-block style
Merge branch 'dev' of github.com:oneyoung/django-blog into dev
+ html: add background & navbar
blog.html: add scroll effect
+ html: add foot
+ models.py: add a key to track usage of images by Blog
Merge branch 'dev' to mainline @2013.04.05