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