comments and testability improvments
fix service check in tasks
identify only visible layers in bindPopup
add L.esri.request docs
doc new options for Task
merge latest changes from master
warn about missing OIDs

a few tweaks

warn about missing OIDs

added check for console.warn
remove cluster and heatmap, UMD compatibility
Merge branch 'master' of github.com:Esri/esri-leaflet
fixed linting
Merge pull request #371 from jgravois/fields-no-id

warn about missing OIDs