make sure there will be no stale version of samples after make clean

Author: hohong

Release/samples/BingRequest/Makefile

@@ -1,5 +1,5 @@
 $(OUTPUT_DIR)/BingRequest: bingrequest
-	cp bingrequest $@
+	mv bingrequest $@
 
 bingrequest: ../../collateral/Samples/BingRequest/bingrequest.cpp 
 	$(CXX) $(BASE_CXXFLAGS) -I$(CASABLANCA_INCLUDE_DIR) $^ -o $@ -L$(OUTPUT_DIR) -lcasablanca -lboost_thread -Wno-sign-compare -Wno-unused-parameter 

Release/samples/SearchFile/Makefile

@@ -1,5 +1,5 @@
 $(OUTPUT_DIR)/SearchFile: searchfile
-	cp searchfile $@
+	mv searchfile $@
 
 searchfile: ../../collateral/Samples/SearchFile/searchfile.cpp 
 	$(CXX) $(BASE_CXXFLAGS) -I$(CASABLANCA_INCLUDE_DIR) $^ -o $@ -L$(OUTPUT_DIR) -lcasablanca -lboost_thread -Wno-sign-compare -Wno-unused-parameter