Venues controller now breaks on multiple Venue#create calls due to model validations

[dpritchett]

We can replace most of those :create / :destroy cycles by just using a Geocoder library method. I actually tried to fix this myself and submit a PR but I went down a rabbit hole pretty quickly when I realized I didn't know what/if the fliter_venues_near_by method was doing.

> Geocoder.coordinates("90210")
Geocoder: HTTP request being made for http://maps.googleapis.com/maps/api/geocode/json?address=90210&language=en&sensor=false
=> [34.1030032, -118.4104684]