Changes made as per review

Loading spinner added
icons and associated formatting improved
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# On branch dl_estimate_speed_fixes
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#	modified:   src/test/javascript/portal/cart/DownloadEstimatorSpec.js
#	modified:   src/test/javascript/portal/cart/DownloadPanelItemTemplateSpec.js
#	modified:   web-app/js/portal/cart/DownloadEstimator.js
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#	web-app/js/GeoExt1.1/resources/images/default/anchor_new.png
#	web-app/js/GeoExt1.1/resources/images/default/anchor_top_new.png
#	web-app/js/portal/cart/.vagrant/
#	web-app/js/portal/cart/Vagrantfile