Implement CSV importer for agency data

Give admin ability to import a large number of agencies at a time, using spreadsheet that includes agency address, contacts, etc. along with what kinds of food they can accept. 
*accepted food types are in the form of 0's and 1's, per each food type id determined by Feeding America. 

Ok here's what I would do. Create a method `agency_data` that runs the four private methods. You don't have to initialize a variable for each step. I don't think you use it elsewhere. Then for each row in the CSV you can just call `Agency.create(agency_data)`.