Complain when no lat/lng column is found

[jsoma]

Misspellings seem to be the #1 issue with maps not displaying correctly

[Kevin-M-Smith]

Hi @jsoma,
Thanks for this helpful library!
I'd be happy to take on this issue - what sort of warning do you have in mind?
Would a simple alert() suffice? Perhaps console.log() would be better? Something else?
Regards,
Kevin