Add foursquare to dialog; fix json_data bug.

Add:
	templates/make_tour.html
		-add foursquare information -- total checkins and currently checked-in
		-- to every location dialog div.

Fix:
	py/google_places.py
		-json_data occasionally had a length of 0, causing an Index Out of Range
		exception; fixed with a conditional on the length.
Merge branch 'master' of github.com:stuycs-softdev/proj3-6-VSSD