Replaced standared animated GIF with the satelite bunjil_logo
update to Google Analytics script fragment.
Minor improvements to logging - remove print statements that appear in
production logs.
animation of the favicon for ajax loading.
Fiixed defect that only slider was calling the callbacks. Now Checkbox
is also calling the callbacks with val=0 or 100.
Refactored LandsatGrid into a object based on the OverlayView protype.
Connected LandsatGrid opacty to the layer sliders.
Extracted some of the functionality from view-obs to overlay-mgr.js for
reuse in other pages that may use overlays.
Fixed Defect BPA-54
minor changes to make the tiles more persistent.
Updated Observation Model to contain a list of OVerlays.
main.py handler supports fetching the observations.
started to add handler to get prior observation overlay.
removed unused functions.
updates to ignore thumbnail files in images folders.
Set role  new Observation to 'latest'
Fixed the Opacity Issues.
Replace customer-tile-overlay.js (which inherits from prototype
OverlayView) with the ImageMapType which is used in the Google Hello
World example. This is much simpler code.

Both image overlays and LandsatGrid overlays to work based on the slider
values - values 0-100 in the slide map to 0-1 in the overlay.

TODO: Note that Border of AOI does not adjust oopactiy with slider yet.
Added new google analystics script. old one is still there.
Refactored to replace GetObservationHandler with CreateOverlayHandler
and UpdateOverlayHandler.

GetPriorObservationHandler is still a WIP. 
Minor updates to Obs and Overlay models.
Major refacor of view-obs to support creating and updating overlays.
Still not calling priorOverlay or testing if tiles are stale.
replaced getTaskImageOverlay() with refactored displayObsOverlay()

Added eeservice.getPriorLansatOverlay() but returning black images if
called.
Added filter for user_task.url and task.url
minotr change to args. sdk check on
minor syntax fix - missin a <
added a url to user task,
image no longer required.
A standalone test that doesn't work. ssl.c errors on authenticate.