use map variable passed to onAdd function as the map in metadata funciton

[kneemer]

Resolves #26

The map in the metadata function is a little ambiguous and when using Browserify it refers to the map container not the map object.

The map in the onAdd function is passed in as the proper map object when using Browserify so use it instead.

[jgravois]

all grunt tests passed, but this caused errors fetching picture marker symbols for me when running debug/sample.html and the code snippet in the readme until i added this

this._setRenderers = function(geojson){
    ...
    options = {url: this._service.options.url};

[kneemer]

This is only the case with the new change?

You had to change
options = {url: this.url};
to the above?

[kneemer]

I wasn't able to reproduce your error at first but I was using esri-leaflet RC 4. Once I switched to RC 5, I saw the error. I see the error when I roll back this change so it should probably be a separate issue.

Related to the breaking change: Esri/esri-leaflet#420

[jgravois]

💡