Esri/esri-leaflet — pull request #330 by oslek (2014-08-10 18:28:29+00:00)
Title: Change param name `key` to `url`

Change to match the `initialize` function, which uses param name `url`. Param name `key` is appropriate for the `basemapLayer` constructor, but `url` seems correct here. I will also submit pull for documentation update.