make map move when setters used for lat/lon/zoom

[AliyanH]

• Pan/zoom the map when lat/lon/zoom are set.
• Add tests
• update documentation
• Update Spec

resolves #588.

[prushforth]

This looks good. Let's wait ${some_time} to see if we get an answer about whether we should be reflecting lat,lon,zoom to the content attributes. We will have to update the spec to codify the behaviour, one way or another.

[AliyanH]

This looks good. Let's wait ${some_time} to see if we get an answer about whether we should be reflecting lat,lon,zoom to the content attributes. We will have to update the spec to codify the behaviour, one way or another.

Yup, sounds good!