Generate List of New Toggle/Waffle Flags From Release to Release

This needs some refinement but it works!

git checkout open-release/redwood.master
cd edx-platform
# This will demand that you install a LOT of operating system pre-requisites like libxmlsec1-dev on Ubuntu
make requirements # This MUST succeed cleanly for the make xml command below to work!
cd docs 
make xml 
mv _build/xml xml-nutmege
git checkout open-release/olive.master
rm -rf _build
make xml 
mv _build/xml xml-olive
git diff xml-nutmeg xml-olive