NOT WORKING FOR VERSION 0.42!
Unfortunately after changes in version 0.42 I was not able to find a way how to make it working again. The Ghost guys encapsulated the editor really well.
Chrome Extension - Adds RAW TEXT button to your ghost editor. This enable to switch editor to the simple mode where the browser spell checking is working.
I couldn't find a spell checker support in Ghost bloging platform (https://ghost.org). I couldn't find integration points to extended for this feature so I created chrome extension which does this job.
You can install the chrome extension from Chrome Web Store: https://chrome.google.com/webstore/detail/ghost-editor-raw-text-but/flcgagocnilfdaigipejmegagelhpafd?hl=en