Experiment with pulling n-makefile in via a git submodule

[matthew-andrews]

[apaleslimghost]

I have an idea. When you include a makefile, if there's a target in the current makefile for it, it's made before it's included. You could distribute n-makefile via npm, and do something like:

include node_modules/@financial-times/n-makefile/n.makefile

node_modules/@financial-times/n-makefile/n.makefile:
    npm install