Add a loading/error view to display before the map view full loads and show errors if the loading fails.

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Adjust the callout so that it's layer refreshes (if needed) and then pops the callout.

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Forgot to commit the resources for the map loading view

Signed-off-by: Blake Skinner <bskinner@mit.edu>
More tweaks to the callout display. It should now occur right after a ArcGIS layer sync

Signed-off-by: Blake Skinner <bskinner@mit.edu>