Shopify Library Setup

Hello,
I've just made a few initial commits to set this project up to be more of a library. I don't know if you're interested in having things setup this way but I thought I would just submit this PR in case you are.

Anyway, I'll be developing on my fork for my own project that will be using this lib and would be happy to send you any future PR's if you like.

Notes:
* Set up the cabal file in the code base
* Removed the comments form the cabal file (just to clean things up a bit)
* Setup docker + fig for easier portable development - in case theres any portability issues for cabal/ghc versions.
* Moved src to src/Network/API/