refs: https://github.com/TryGhost/Toolbox/issues/479
Framework includes:
* command to run tests
* command to record tests
* mechanism for starting and stopping Ghost before and after each suite of tests
* mechanism for loading fixtures into Ghost before starting tests
* sample test for controlling Ghost Admin
refs https://github.com/TryGhost/Toolbox/issues/354
- this commit turns the Ghost repo into a monorepo so we can bring our
internal packages back in, which makes life easier when working on
Ghost
