Min and max zoom level options for markers

[gsterndale]

Hi!

I found some odd marker behavior when they were created outside the MarkerManger's maxZoom.

This commit provides settings options for min and max marker zoom levels with reasonable defaults.

I'm not too familiar with Smoke and couldn't find a way to set an expectation that the MarkerManager constructor is called with the maxZoom option. Perhaps you know how???

Thanks for all the hard work!
Greg

[brianjlandau]

Can you show me an example page of the problem you're seeing?

[gsterndale]

Hi Brian!

I just rebased these commits on top of recent (related) upstream work.

If you look at one of these example pages and zoom way out, the markers disappear. I found that if the map is loaded at a zoom level outside the normal visible range, the markers appear initially, but after zooming in then back out, they'd disappear.

My commits should allow developers to define what zoom level range they prefer for their markers.

Let me know what you think.

Best,
Greg