Support relative sizes for maps

[rick-de-water]

Width and Height are defined in pixels, and there is no way to set a map to a relative value such as a percentage. This makes dynamically filling part of the screen with the map very difficult.

[rick-de-water]

I work around the issue for now by putting the map in a div and adding the following css:

.map-container > div {
    width: 100% !important;
    height: 100% !important;
}