Implement CMS

[tedliang]

Basic spec:
We want to replace wordpress with our own simple content management. (leave wordpress feature as optional).
We need to be able to

• create categories (CRUD)
• create posts (use dojo HTML editor) (CRUD)
• set multiple categories per post (MVP is one category per post)
• upload images to posts (MVP is one photo per post, but it would be nice to have a different one for mobile content)
• A post should have a fields, date, title, summary, text, author (userID), flag for draft/published.

Later we will need, version history, approval?, etc... but not now.