Add an overlay container.

[HooverG]

Hello,

You should add an overlays container in order to reuse them in external js or other stuff ... and be abble to add for eg a clearoverlay function in our external js.
cirlces[] =
markers [] =
etc.

I'm in an app where I don't want ivoryGMB to render the map but only markers and overlays so I have to do define my js map var and do partial rendering (markers, circles, etc.)

[egeloen]

The issue is now fixed :)