Removed API versioning from webhooks
Removed API versioning from webhooks

refs: https://github.com/TryGhost/Toolbox/issues/229
refs: https://github.com/TryGhost/Toolbox/issues/283

- we are getting rid of the concept of having multiple api versions in a single ghost install
- we'll update webhooks to return a content version
- we're also looking into if we need some sort of accept-version type logic

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost