#230 Auto generate country dropdown

Used to evaluate the progess on this issue so far
You can't use variables as keys in object literals in JS (at least, not yet). Currently, this will set a property named 'fieldName' in the state. This is gonna look somewhat roundabout, but you'll have to do:
```javascript
var newState = {};
newState[fieldName] = event.target.value;
this.setState(newState);
```