Create GET params from Request Body Data for GET Requests

## For GET requests, convert request body data to GET parameter

### Acceptance Criteria
1. `httpGateway::apiRequest`converts the `data` hash into query parameters if the method is `GET`.

### Tasks
- Port `toQuery` from [underscore-contrib:util:strings](https://github.com/documentcloud/underscore-contrib/blob/master/underscore.util.strings.js)

### Additional Notes
- None