wire up "scan my history" button on first run page
add progress indicator to history check page
add scan history button to the panel
rough but working history scan (!!!)
slightly nicer result list styles
update ui when scan finishes
add tool to generate json from text list of vulnerable domains
load vulnerable set with promise before starting scan
fix loop in clearing storage (forgot to reset storage.version)
hack to handle failed requests due to lack of connectivity
better title for history check page
prettify
remove unnecessary logging
add ui for sites that are not vulnerable, but once were
only scan last 3 months of history (arbitrary)
cache vulnerable domains permanently

we want to be able to determine if a domain was vulnerable but is now fixed. To
do so, we record all domains that were ever vulnerable in a separate cache from
the main response cache (which always reflects the results of the latest
lookup).
fix styles for notVulnerable wasVulnerable
hack to get the preloaded wasVulnerable list working
clarify  ux for "scan my history" panel button

1. if the scan history tab is already open, just switch to it instead of
   opening a new one (or trying to run the same code again in the open tab and
   spazzing out)
2. Close the panel so the user focuses on the new tab
better ux for clicking button while page loaded, restarts the scan