Commits on Jul 8, 2016

1. "400 Version Mismatch" error handling …

   refs TryGhost/Ghost#6949
   
   Handle version mismatch errors by:
   - displaying an alert asking the user to copy any data and refresh
   - disabling navigation so that unsaved data is not accidentally lost
   
   Detailed changes:
   - add `error` action to application route for global route-based error handling
   - remove 404-handler mixin, move logic into app route error handler
   - update `.catch` in validation-engine so that promises are rejected with the
     original error objects
   - add `VersionMismatchError` and `isVersionMismatchError` to ajax service
   - add `upgrade-status` service
     - has a method to trigger the alert and toggle the "upgrade required" mode
     - is injected into all routes by default so that it can be checked before
       transitioning
   - add `Route` override
     - updates the `willTransition` hook to check the `upgrade-status` service
       and abort the transition if we're in "upgrade required" mode
   - update notifications `showAPIError` method to handle version mismatch errors
   - update any areas where we were catching ajax errors manually so that the
     version mismatch error handling is obeyed
   - fix redirect tests in editor acceptance test
   - fix mirage's handling of 404s for unknown posts in get post requests
   - adjust alert z-index to to appear above modal backgrounds

   

   kevinansfield committed Jul 8, 2016
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2. Refactor error handling …

   closes TryGhost/Ghost#6974
   - update "change password" fields/process to use inline validations
   - remove `notifications.showErrors` and update all uses of it to `showAPIError`
   - display multiple API errors as alerts rather than toaster notifications
   - refactor `notifications.showAPIError`
     - remove `notifications.showErrors`, use a loop in `showAPIError` instead
     - properly determine the message from `AjaxError` or `AdapterError` objects
     - determine a unique key if possible so that we don't lose multiple different alerts
   - add `ServerUnreachable` error for when we get a status code of 0 (eg, when the ghost service has been shut down)
   - simplify error messages for our custom ajax errors

   

   kevinansfield committed Jul 8, 2016
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3. "503 Maintenance" error handling …

   refs TryGhost/Ghost#6976
   - adds custom `MaintenanceError` and associated error checking functions
   - updates app route and notifications service to handle `503` errors via the `upgrade-status` service

   

   kevinansfield committed Jul 8, 2016
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