Merge case steps into case records

I simplified the schema by putting everything into the case records table. I don't have anymore time to work on this tonight and unfortunately I couldn't figure out how to break the crimes and activities into separate join tables in a good way. It works the way I've done it, but it caps the amount of crimes and activities at a maximum of 5 each.

I added a seed file so that the activities and crimes populate with random words. So make sure to run rake db:seed after you run your migrations.

Let me know if you have any questions. I will be busy most of the day tomorrow, but I may have some time at night to work on this project.