WIP on minimap preview.
We should think of something to not load minimaps currently not in view until they move into view
Making preview more visual, only render minimaps if in view
fix L.Sync: turban/Leaflet.Sync#9
move minimaps to the right again, some cleanup
10px top + right margin.
Cleanup, jshinting
Use cleaned of the control and add overlays as overlays to the control again
Merge pull request #72 from leaflet-extras/preview-minimap

Minimaps for preview.