Quote parameter expansions in hex_with_bootloader() of

bin/kaleidoscope-builder. Issue #299.

bin/kaleidoscope-builder

@@ -114,12 +114,12 @@ hex_with_bootloader () {
         compile
     fi
 
-    cat ${HEX_FILE_PATH} | awk '/^:00000001FF/ == 0' > ${HEX_FILE_WITH_BOOTLOADER_PATH}
+    awk '/^:00000001FF/ == 0' "${HEX_FILE_PATH}" > "${HEX_FILE_WITH_BOOTLOADER_PATH}"
     echo "Using ${BOOTLOADER_PATH}"
     ${MD5} ${BOOTLOADER_PATH}
-    cat ${BOOTLOADER_PATH} >> ${HEX_FILE_WITH_BOOTLOADER_PATH}
-    ln -sf "${HEX_FILE_WITH_BOOTLOADER_PATH}" "${OUTPUT_PATH}/${SKETCH}-latest-with-bootloader.hex"
-    cat <<EOF
+    cat "${BOOTLOADER_PATH}" >> "${HEX_FILE_WITH_BOOTLOADER_PATH}"
+    ln -sf -- "${HEX_FILE_WITH_BOOTLOADER_PATH}" "${OUTPUT_PATH}/${SKETCH}-latest-with-bootloader.hex"
+    cat <<- EOF
 		
 		Combined firmware and bootloader are now at ${HEX_FILE_WITH_BOOTLOADER_PATH}
 		Make sure you have the bootloader version you expect.