dont prompt for lock screen, if the user didnt explicitly ask for it or already set us as it
made offlining more aggressive and cut down on the amount of data in a comment listing
implemented cache cleanup based on user configured age slider
HH REALLY needs to build W8 before he commits
fixed bestof links
allow setting lock screen image from PhotoPicker for use with overlay
now that we can set the lock screen from photopicker make sure we can set it back again!