fixing some react deprecation warnings, adding progress circle when logging out
fixing some react deprecation warnings, adding progress circle when logging out

tjcunliffe/hoverfly,tjcunliffe/hoverfly,tjcunliffe/hoverfly,SpectoLabs/hoverfly,tjcunliffe/hoverfly,tjcunliffe/hoverfly,SpectoLabs/hoverfly,tjcunliffe/hoverfly