Allow options to be passed to Map.setMaxBounds such that they can be used when setting the view.
Update Marker.js

According to the Leaflet documentation, setOpacity must return "this".
Merge pull request #1851 from freepius44/patch-1

Update setOpacity() in Marker.js
fixed false FeatureGroup layerremove, close #1847
Merge branch 'master' into stable

* master:
  fixed false FeatureGroup layerremove, close #1847
  Update Marker.js
update changelog
merge #1834 (passing options to setMaxBounds)
Merge branch 'master' into stable

* master:
  update changelog
  Allow options to be passed to Map.setMaxBounds such that they can be used when setting the view.