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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.
@allObjects
I'm not exactly sure what you really want to achieve. Both Espruino and Intel Edison 'Arduino' boards are brakout boards for respective platform and thus act both as masters and kind of emulating Arduino boards to accept Arduino shields ('slaves').
To connect Espruino to Edison serially, you need 3 wires: GND to GND, TX to RX, and RX to TX.
Stacking the breakouts 'can' make partially sense, if you want to monitor with one with the other one, for example for testing... but even then, a one-to-one connection of both the pin mappings of Espruino and Intel Edison to Arduino board pinouts may leed to conflicts, as TX to TX and RX to RX show. Rather than cut (all) traces and rewire (all of) them, you need a switchboard on which you make the connection as required by the application you have in mind. Which of course starts with making both boards talking to each other... over on of their USARTs. You cold think also using SPI or I2C, but that has other caveats... such as who can be a slave... afaik, Espruino is master only for both I2C an SPI.