publish to progress.queue channel when ajax event are added or removed through the ajax-handler
update ajax-handler clear function to publish a remove call to the progress queue channel
Merge branch 'develop' of github.com:ozone-development/meridian into enhancement/190/connext-ajax-handler-to-progress-queue

* 'develop' of github.com:ozone-development/meridian:
  Add check to see if the layer has identified features before executing clearMapPoopups and clearMapSelection
  update internal pubsub tester sample payload for map.zoom.toLocation
  update zoomToLayer, to check OL for layer existence and non-null OL extent
  update map.zoom channels for internal pubsub tester
  change hover color to not go grey on hover, like the rest of the nav tools
  add clear queue and hook it to data.clear.all
  update internal pubsub tester with added channels
  update index file to add new progress-notification component
  add basic functionality to hide/show a progress spinner via pubsub
  Add check in zoom to layer function to see if no data in layer.
Merge pull request #191 from ozone-development/enhancement/190/connext-ajax-handler-to-progress-queue

Enhancement/190/connext ajax handler to progress queue