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
Use SODA gem to get data

* Add soda-ruby and remove httparty
* Reorganize data query to work with soda-ruby
* Create new model for working with soda-ruby
Create Home model and change casualties

* Move business logic from homes controller to home model
* Get individual counts of types of casualties
* Will be more useful than booleans