Add collision data to map

* Get data from SODA API using HTTParty
* Clean data and enter into database
* Add markers representing data to map using MapBoxJS
* Move map directly into home show page
* Improve use of MapBox gem
So right now, if the data is bad, I delete RawIncident so Incident won't be created. If I'm using IncidentParser instead, how do I prevent Incident from being created if the data is bad?