white spaces alignment fix
removed spinner from MapPanel when layers are loading
added events for layer loading start/end
handling layerLoadingStart/End events
delegating layer loading start/end to tree node
spinner button appears and disappears as needed
in ActiveLayersTreeNodeUI, changed buttons array to be a hash
removed console.log line
fixed data collection spinner item having 'undefined' attributes
added 12x12 spinner gif
data collection spinner styling
layer-loaded-button also needs styling, so it doesn't resize row
removing code is always good - removing layer load counting in LayerStore
refactoring around the loadingSpinner, nicer jQuery concatenation of functions, removed redundant events subscription
fixed tests for loading spinner branch, removed references to currentlyLoadingLayers in LayerStore
Merge pull request #466 from aodn/loading_feedback

Loading spinner for individual maps loading