replaces #56

fixes #50

fixes #48

* looks for a media endpoint in the micropub config
* if media endpoint is available, both the note interface and the editor will upload files to it instead of posting the photo directly
* the note interface autosaves in-progress notes in localstorage

Also set the theme color for Chrome to the blue used
in the logo.

Firefox picks up the last defined icon PNG for the add to
homescreen feature - https://bugzilla.mozilla.org/751712

The `#note_photo` form element is the only instance in the application
that used the attribute.

Accidents happen, you shouldn't have to refresh the entire page
to get rid of the image.

closes #36

* it sometimes confuses web servers to have a folder named "editor" while also serving routes with the same name
* dropped appcache stuff since it wasn't working super well
* add nginx config to the readme

Quill corrects the photo rotation based on exif data since iOS tends to take landscape photos and set the rotation bit when holding it in portrait mode.

Twitter changed some XSS security settings which prevents Quill from injecting JS onto the page for the inline "favorite" button. This change makes it open the "favorite" screen in a new window.

With this it is possible to post a photo note with a description, nothing
more. It doesn't move the file in the file system, just posts it from
the temp location to the users server. It also does validate for file size,
content type and max upload size and shows the errors to the user.

If everything goes according to plan the response from the users server
is shown, together with a link with the posted photos URL.