PAL : Use userIds from bid_request in case of non userIds given in win message
Merge pull request #57 from datacratic/PAL_userIds

PAL : Use userIds from bid_request in case of non userIds given in win message
Started the MultiBidderInterface implementation
The MultiBidderInterface is now dispatching nearly all the calls
Merge branch 'master' into RTBKIT-581-multi_bidder_interface
The MultiBidderInterface does not use the auctionId anymore to dispatch the calls
Handle empty bid request + log error in Graphite
RTBKit exchange connector now fills the priority in the Bid ext field
Fix test when receiving empty bid request
Be sure filterRegister is initialize before register new filter
Add verification of external-id ext field : be sure it is an array of integer
Merge pull request #63 from datacratic/FilterOrderingInitialization

Be sure filterRegister is initialize before register new filter
Merge pull request #61 from datacratic/HandleEmptyBidRequest

Handle empty bid request + log error in Graphite
Add break in case of error
Merge pull request #62 from datacratic/ExtIDFieldProtection

Add verification of external-id ext field : be sure it is an array of integer
Merge pull request #60 from datacratic/RTBKIT-581-multi_bidder_interface

RTBKIT-581 MultiBidderInterface
The HttpBidderInterface now handles 204 HTTP status code
Merge pull request #64 from datacratic/RTBOPT-824-http_bidder_no_bid

The HttpBidderInterface now handles 204 HTTP status code
HttpBidderInterface: Making sure to remove the trailing characters that might be introduced
by Json::FastWriter
JsonRestProxy: added "maxBackoffTime" for exponential backoffs (TRIVIAL)