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. 

Just do something like
```
def my_hash
  {
    item_one: :one,
    item_two: :two,
}
````
then when you call `my_hash` it returns the hash