Post uploader, replace post body instead of ignoring post if title is the same

1. The problem

Currently SCM ignores posts that have the same title already on the wp blog.

It might be useful to instead replace the post content with the new content trying to be uploaded.

eg: regenerate the content all the content on the blog, and use post uploader to update it.

This will add a new checkbox that allows the post uploader to ‘replace existing posts’