Use Whenever to set cron job to get collision data

* Install cron job gem Whenever
* Set cron job to get collision data at 2am every morning
* Remove unnecessary and unfortunate Home model
* Whenever should work on Digital Ocean
* Will have to use Heroku Scheduler instead if using Heroku
Merge pull request #6 from HayleyCAnderson/cron-job

Use Whenever to set cron job to get collision data