soa submodule catchup for redis spin polling fix.
Added additional timing metrics for the augmentor message flow.
restored commented test
libexchange depends on libbid_request and librtb
moved around value descriptions in RTB
ValueDescription<void> -> ValueDescription, ValueDescription<T> -> ValueDescriptionT<T>
Cleaned up the agent configuration console dump.
updated submodules
    removed AdServerConnector class
    AccountSummary: renamed "available" to "balance"
    AccountSummary: removed lineItems, adjustment* and allocated
    json_listener: added request accounting and "/stats" request
    moved PostAuctionEvent and SubmittedAuctionEvent in common/
    added unit test that ensures the values of AccountSummary are consistent with those of the underlying accounts
    replaced impression/click events with equivalent campaign events
    removed doVisit and related functions from PA loop
greatly improved the handling of bid requests in JS; fixed most of the test failures caused by request processing
merged in latest head on master