Move stream reference to method rather than constructor
Fetch feed directly from DDP.
Extract interface for IBPReader.
Add skeleton twitter client and tweet log.
Extract test stream to a separate class.

We're going to reuse this elsewhere in a minute.
We should initially tweet exactly ten times with the given data.
Program initially just tweets everything.
Only tweet untweeted briefing papers
Pass URL in constructor to BPReader
Read type into the briefing paper data
Tweet the type as well as the title