Stream api

create -> POST /api/v2/stream
 {"text": "the message"}
 most recent (default 20) -> GET /api/v2/stream
  list of tweets {ID, text, author, timestamp, epoch}
  Optional query param: limit => postive integer

 Tweets newer than time -> GET /api/v2/stream?start=epoch
 epoch => unix timestamp in millis
 limit => positive integer

 Tweets older than time -> GET /api/v2/stream?start=epoch&older_posts=true
  limit => positive integer

Resulting index:
{"stream_posts":[{"id":"547217056313b18cd500001e","author":"kvort","text":"@james challenge accepted.","timestamp":"2014-10-14T11:31:00.000Z","epoch":1413286260000,"photo":null}, ...],"next_page":1413286019999}

--------
Get tweet by ID -> GET /api/v2/stream/tweet_id
{"id":"547217056313b18cd500001e","author":"kvort","text":"@james challenge accepted.","timestamp":"2014-10-14T11:31:00.000Z","epoch":1413286260000,"photo":null}

DELETE tweet by ID -> DELETE /api/v2/stream/tweet_id