Minor makefile fixes - add phony targets, remove silence switch from the root makefile and add missing build modules to the ClassDriver VirtualSerial device demo.

makefile

@@ -17,9 +17,9 @@ all:
 %:
 	@echo Executing \"make $@\" on all LUFA library elements.
 	@echo
-	$(MAKE) -C LUFA $@ -s
-	$(MAKE) -C Demos $@ -s
-	$(MAKE) -C Projects $@ -s
-	$(MAKE) -C Bootloaders $@ -s
+	$(MAKE) -C LUFA $@ 
+	$(MAKE) -C Demos $@
+	$(MAKE) -C Projects $@
+	$(MAKE) -C Bootloaders $@
 	@echo
 	@echo LUFA \"make $@\" operation complete.