Modified protobuf_for_node.cc to support modified 64-bit integers.
Modified protobuf_for_node.cc to support modified 64-bit integers.

avail/protobuf-int64,avail/protobuf-int64,avail/protobuf-int64,pzduniak/protobuf-int64,pzduniak/protobuf-int64,pzduniak/protobuf-int64,avail/protobuf-int64,pzduniak/protobuf-int64,pzduniak/protobuf-int64,avail/protobuf-int64