Add dfu-util command for programming

Also add .bin generation, which is needed for dfu-util.

tmk_core/chibios.mk

@@ -113,6 +113,7 @@ AR = arm-none-eabi-ar
 NM = arm-none-eabi-nm
 HEX = $(OBJCOPY) -O $(FORMAT)
 EEP = 
+BIN = $(OBJCOPY) -O binary
 
 THUMBFLAGS = -DTHUMB_PRESENT -mno-thumb-interwork -DTHUMB_NO_INTERWORKING -mthumb -DTHUMB 
 
@@ -151,4 +152,7 @@ else ifneq ("$(wildcard $(KEYBOARD_PATH)/boards/$(BOARD)/bootloader_defs.h)","")
 endif
 
 # List any extra directories to look for libraries here.
-EXTRALIBDIRS = $(RULESPATH)/ld
+EXTRALIBDIRS = $(RULESPATH)/ld
+
+dfu-util: $(BUILD_DIR)/$(TARGET).bin sizeafter
+	dfu-util -D $(BUILD_DIR)/$(TARGET).bin