Jesse Ruder 56fef9b622 Allow duplicate keys in FormData
Summary: Right now `FormData` doesn't allow duplicate keys and uses the last value set for a duplicate key. I tested this in Chrome:
```
var formData = new FormData();
formData.append('key', 'value1');
formData.append('key', 'value2');

var request = new XMLHttpRequest();
request.open("POST", serverUrl);
request.send(formData);
```
and the request has both 'value1' and 'value2'.

I removed the duplicate key check in `FormData`. If people want to build appending or disallow duplicate keys, they can build either on top of this.
Closes https://github.com/facebook/react-native/pull/3556

Reviewed By: svcscm

Differential Revision: D2566999

Pulled By: nicklockwood

fb-gh-sync-id: 580e52e69376ebe9693e39a386cc540802b6d94f
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