Capability: Create, initialise, and display a map

[NickFitz]

This issue is for discussion of the API capability "Create, initialise, and display a map".

[prushforth]

This capability should be split into separate capabilities, I believe. If, as I suggest in #137, the viewer is created via a single (parent) element, then an API to do the same would simply require the creation and insertion of a DOM node with relevant properties.