Options for LayerGroup (#5792)
Options for LayerGroup (#5792)

* Options for LayerGroup

Add options parameter to L.Layergroup.initialize and set options.

* Options for LayerGroup factory

Added options parameter to LayerGroup factory method and updated docs

stefanocudini/Leaflet,Leaflet/Leaflet,msiadak/Leaflet,Leaflet/Leaflet,stefanocudini/Leaflet,msiadak/Leaflet,CapeSepias/Leaflet,CapeSepias/Leaflet,stefanocudini/Leaflet,CapeSepias/Leaflet,Leaflet/Leaflet,msiadak/Leaflet