no issue
- in the near future, non-Ghost Ignition type errors will be coming into
Sentry
- because they don't have a statusCode, they'll be rejected
- we want to detect if they're non-Ghost and still deal with them
* moved `server/config` to `shared/config`
* updated config import paths in server to use shared
* updated config import paths in frontend to use shared
* updated config import paths in test to use shared
* updated config import paths in root to use shared
* trigger regression tests
* of course the rebase broke tests
- added core/shared to watched folders in grunt
- moved sentry to shared
- moved express initialisation to a shared file
- always set trust proxy + sentry error handler
- use this new express init everywhere, and remove duplicate trust proxy and sentry error handler code
