Adding basic proof-of-concept pubish/draft support

* Added WpPressThis::report_and_redirect()
* Added WpPressThis::publish()
* Added WpPressThis::save_draft()
* Modified WpPressThis::press_this_php_override() with “routing” logic
to publish, save draft or serve default app html/js.
PHPDocs

Adding PHPDocs code blocks