Create a Venue model in mongoose for caching

[pete-ryu]

https://developer.foursquare.com/docs/responses/venue

name, address, lat, lng, category (cuisine), hours, menu, price (how expensive), rating, etc.

[ajstocchetti]

As per forsquare, we shouldnt just steal their venue info. we should query them every time
https://developer.foursquare.com/overview/venues#rules

[pete-ryu]

Updated this to be an "enhancement" instead