Revert "update README to match latest schema"

This reverts commit d0c7e9abe1445981a91de0862e18a0a998403c0b.
Revert "restructure userline/timeline"

This reverts commit ff06d4a9b0f6d43780eb03a0f26209f2fcbe5c71.
change name of posted_at attr to tweetid