Propose adding title tooltip to the markers

Added using the 'title:' option of the L.marker
not 100% sure line 858 is correct
(my first fork proposal so be gentle #n00b)
Merge branch 'patch-1' of https://github.com/bradgarner/ingress-intel-total-conversion into bradgarner-patch-1
fix small bug from #713 - and also use method rather than private data for lat/lng