Add support for external 3rd party firmware flashing!

[krak3n77]

We need to be able to add our own custom firmware!

[chalkers]

Can you give me an example?

[krak3n77]

I have a firmware .bin file that I want to flash to my esp8266. And it is not on the list!

[krak3n77]

I want to add the firmware to the list.