Added content folder initialization to e2e-framework
Added content folder initialization to e2e-framework

refs https://github.com/TryGhost/Toolbox/issues/129

- Adds content folder creation based on fixtures for e2e tests using the e2e framework
- Mostly a copy-paste for now from existing e2e utils with some simplifications, so we can "complicate things" later only if needed

e10/Ghost,TryGhost/Ghost,e10/Ghost,TryGhost/Ghost,TryGhost/Ghost