add overlay maps

[WardCunningham]

Leaflet is happy to overlay images so we add that capability with specialized markup.

Here we overlay the George Fox University campus map within the city of Newberg, Oregon and then locate the Engineering Maker Hub on that map with a clickable marker.

[WardCunningham]

Not sure when or how, but the fixing of the mouse-grabbing of the map plugin was a life-saver. The interaction is not perfect but workable now - although mobile is tricky - ideally we want to be able to fix a map so it is not able to scroll and enable a full screen mode (or link to a new tab) where we can scroll in the map.

@fortyfoxes: Please explain what behavior is different with the map plugin. It was not my intention to change anything other than adding the overlay. Some Leaflet expertise would be helpful.

[paul90]

Looks as if David is referring to a behaviour that was resolved in 5f04e66 (June 2018). If I remember correctly this was made possible thanks to upgrading to a newer version of Leaflet.

[WardCunningham]

For the decimal notation the point example has a space after the comma. Having a space after the coma is not allowed by the current OVERLAY. I think it would be an idea to allow a space. What do you think?

I agree. With such a long command it is still a good idea to use space sparingly. I was feeling that I was overly generous with the other regular expressions.

[paul90]

Published as + wiki-plugin-map@0.3.6