Awexome! Thanks Dave 
I put the binaries in my PATH and they work. Just had to install the Zatig WinUSB driver for the CORE DFU device that pops up with you put the 
Core into DFU mode (Flashing Yellow). Built the master branch and I’ve got Tinker loaded as expected.
Earlier I had replaced the SPARK CORE WITH WIFI device that is present when the Core has booted, with the Zatig WinUSB driver. So I’m guessing I should put the other driver back that creates the USB to Serial Bridge.
One problem I am now having is when I try to rebuild the project again by typing make in the core-firmware\build directory, I get this error:
obj/src/application.o.d:1: *** multiple target patterns. Stop.
Also can anyone comment on about how long it takes to compile the sources this way? I will time mine again when I get it working, but it seems to take quite a while longer than the web IDE.