Move to Google protobuf for Instruction

transportinstruction.proto

@@ -0,0 +1,12 @@
+option optimize_for = LITE_RUNTIME;
+
+package TransportBuffers;
+
+message Instruction {
+  optional uint64 old_num = 1;
+  optional uint64 new_num = 2;
+  optional uint64 ack_num = 3;
+  optional uint64 throwaway_num = 4;
+
+  optional bytes diff = 5;
+}