reimplemented the DefaultDescription classes for SegmentList and SegmentBySource in a way that avoids using Json::Value
separated interface and implementation
libbid_request must be linked again libvalue_description
Merge branch 'json-speed-improvements'
updated soa
made the win cost model deterministic
Reverted the soa submodule to bypass an id serialization issue.
MockExchange now gracefully handles no-bids responses.
updated soa
Merge pull request #3 from rtbkit/master

sync with upstream