Add temp/ directory
Set up South for db migrations
Add randomly chosen item_id to each blog post.

This commit does three things:
1) new models.py and migration file for South migration to add item_id to home.post db
2) new Post instances will now be assigned a random item_id upon creation, as per models.py
3) a script to backfill existing db entries with item_id's
Add bare bones page for each post item
Update todo
Merge branch 'master' into comments
Move staging docs into temp/
Add Comment model

and fix some South migration issues.
Display comments on each post's page

Permalinks and parent links are currently broken, awaiting signficant refactor.
Add comment submission form
Display link to discussion on /new
Clearer layout for post discussion page
Merge pull request #17 from alliejones/comment-styling

Clearer layout for post discussion page
Update TODO
Change name 'item_id' to 'slug' in the model
Use 'post' in URL instead of 'item'
Clean up styles
Add human-friendly dates to comments
Update navbar
Remove Random feature