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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, looks good.
TXD is out from the ESP8266 towards the PC, and RXD is into the ESP8266 - so depending on your USB-TTL dongle you may need to swap them. I have dongles labelled both ways here to if it doesn't work it's just best to swap the wires - but it won't damage anything if you have them around the wrong way for a minute or two.
I wouldn't connect
+at all. Just connect GND, RX and TX, and leave the WiFi board connected by USB so you can set up the pins correctly.With the firmware, I don't actually have 0.40 here - I'm afraid you'd just have to google and find it.
This might be the most helpful: http://www.electrodragon.com/w/ESP8266_AT-Command_firmware
As you're all set up, I'd try uploading the newest 'espressif firmware' from that page. It should work fine, and I know it does have some new features (the ability to advertise itself via mDNS is cool).
However it looks like the 0.40.0.0 firmware is available at the bottom of http://domoticx.com/esp8266-wifi-at-firmware/