Add location information for users to kronus server

[Daskott]

Send link with probe, to get user location via browser & store location for each probe

Benefits:

• Simple

Problems:

• Information is not realtime
• Requires very frequent probes to make information more useful
• User experience is not great

Constraints:

• With the use of links, no need to receive Y/N response. Clicking on the link indicates you're okay & sends your location. However, we need to still be able to send Y/N response, for cases where the user has no internet or doesn't want to send location info.

Questions:

• Should the link have Y/N option ? Or should clicking the link prove you're okay ?

Todo:

• Move entire probe verification to web app. User gets' notified with link & they click to verify aliveness
• Given the current constraints, make it as user friendly as possible.
  • Ask user on web_page to include location co-ordinates

Later:

• We could have a mobile app that auto transmits location on each probe