Move cache to database

[lalalune]

We should move all caching, including token cache, content cache, etc into the database. We can store these in a cache manager which could be connected to the memory manager so we can add to the adapters for each database adapter.

1. Move all content caching into memory manager and use store cache and retrieve cache calls
2. Add and test with every database adapter, including sqlite, sqljs and postgres

make sure twitters credentials not broken in tweetcache -- or are saving to db
we should store models somewhere nice
store credentials in db
cache prompts in db?
fix tokencache
content_cache ?