版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/OverlappingMarkerSpiderfier-Leaflet/0.2.6/oms.js
- https://cdn.bootcdn.net/ajax/libs/OverlappingMarkerSpiderfier-Leaflet/0.2.6/oms.min.js
Deals with overlapping markers in the Leaflet maps API, Google Earth-style.