Minor patch to keep posts global isolated

• In https://wordpress.tv/2017/08/11/amanda-giles-level-up-taking-your-wordpress-code-up-a-notch/ it's mentioned that get_post() affects the posts global as well as the query global we already reset. This should hopefully isolate effects of that further.

Minor changes to comply with license

So there was some text from when this was a non-free plugin that has now been removed

Latest Release

Updated to use the_content filter

Now uses the_content filter

Initial Open Source Release

Initial Commit of Open Source Release

This is from a non-open source plugin, now released under the AGPL license