Here is a test release based on Kernel 4.7-rc4. It does boot Edison. You can test it here.
(a) There is mainline support for SDIO based wifi+bluetooth 43221 in kernel now however I havent enabled it yet
(b) The watch-dog isnt managed yet so it reboots every 30 secs
(c) Have to see how to enable support external microsd-card reader.
This should be pretty good once those above things start working in mainline...