Adding simulation files to blink example

Examples/blink/logic/Makefile

@@ -4,9 +4,8 @@ DEVICE          = xc3s250e-VQ100-4
 BGFLAGS         = -g TdoPin:PULLNONE -g DonePin:PULLUP \
                   -g CRC:enable -g StartUpClk:CCLK
 
-SIM_CMD         = /opt/cad/modeltech/bin/vsim 
+SIM_CMD         = vsim 
 SIM_COMP_SCRIPT = simulation/$(DESIGN)_TB.do
-#SIM_INIT_SCRIPT = simulation/$(DESIGN)_init.do
 SIMGEN_OPTIONS  = -p $(FPGA_ARCH) -lang $(LANGUAGE)
 SAKC_IP         = 192.168.254.101
 
@@ -18,13 +17,10 @@ remake:         clean-build all
 
 clean:
 	rm -f *~ */*~ a.out *.log *.key *.edf *.ps trace.dat
-	rm *.bit
+	rm -f *.bit
 
-clean-build: clean
-	rm -rf build
-
-cleanall:   clean
-	rm -rf build $(DESIGN).bit
+cleanall: clean
+	rm -rf build simulation/work simulation/transcript  simulation/vsim.wlf
 
 bits:           $(DESIGN).bit