Merge pull request #79 from sim590/queries

include/opendht/callbacks.h

include/opendht/default_types.h

include/opendht/dht.h

include/opendht/dhtrunner.h

include/opendht/network_engine.h

include/opendht/securedht.h

include/opendht/utils.h

include/opendht/value.h

src/dht.cpp

src/dhtrunner.cpp

src/network_engine.cpp

src/securedht.cpp

src/utils.cpp

src/value.cpp

tools/dhtnode.cpp