Notable changes in core C++
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* OpenSSL and CentOS 7 (#382)
* CXXCBC-144: Search query on collections should not require you to pass in the scope name (#379)
* CXXCBC-145: Search query request raw option not used (#380)
* CXXCBC-194: Support ExtThreadSafe transaction extension. (#374, #376)
* CXXCBC-316: Core txn get_optional after query issue (#385)
* CXXCBC-310: Fixed race condition in transaction_context state machine (#386, #378)