add single header magic

[scalarwaves]

Pertaining to #112 This header is a start for binding to other languages.

Having all core header files in one place makes importing the library version of Gwion much simpler.

Based on this gist by fennecdjay.

[fennecdjay]

Nice! 🍾
I'm a bit worried with the ../ thing thought.
Can't you use something like -I../ast/include -I../util/include ?
It would save us the ../ and gain some flexibility.

[scalarwaves]

Your solution is more elegant, I returned it to its original state.

[fennecdjay]

Looking Good!
Is there anything you want to add for this particular PR?
If not I'll merge as soon as the test succeed (wondering why travis is not showing up).

Does it mean you had some success with codegen?

---

EDIT: probably got travis back.

[fennecdjay]

Looks Good! Merging 🍾
Thank you @scalarwaves.