Issue title: disable spell checker query 
 Issue body: if the option Configuration.spellChecker = false, a request for a file is still 

> Sorry for my English
 Comments: 
 Comment 0: I'm not able to replicate this issue. When I disable spell checker, there are no requests for any of the spell checker's files.
{'source': 'GithubIssues', 'repo_name_with_owner': 'NextStepWebs/simplemde-markdown-editor', 'issue_id': 145947336, 'repo_stars': 3268.0}