Eureka!
So first off I realized that my GimpToSpine.py file was just the html document of the page I downloaded it from. I right clicked the link and said save link as. My mistake. So I just copied and pasted the actual script to file on my computer and named the same.
Second with the new version of gimp you put your plugins in C:\Users\YOUR_WINDOWS_USERNAME.gimp-2.8\plug-ins
Thanks for your help Erikari, I now have Export to Spine in my gimp file menu 🙂