Add global query support via geojson param for forma, quicc, fires

Support for forma-alerts, quicc-alerts, nasa-active-fires. Example:

```javascript
// Fires global query with GeoJSON
var config = {dataset: 'forma-alerts', geojson: JSON.stringify({"type":"Polygon","coordinates":[[[-62.13867187499999,-1.845383988573187],[-64.6875,-7.972197714386866],[-61.083984375,-10.487811882056695],[-52.03125,-5.703447982149503],[-56.77734375,-0.26367094433665017],[-62.13867187499999,-1.845383988573187]]]})};
var callback = function(data) {console.log(data)};
service.execute(config, callback);
// Hits: http://beta.gfw-apis.appspot.com/forest-change/forma-alerts?geojson={"type":"Polygon","coordinates":[[[-62.13867187499999,-1.845383988573187],[-64.6875,-7.972197714386866],[-61.083984375,-10.487811882056695],[-52.03125,-5.703447982149503],[-56.77734375,-0.26367094433665017],[-62.13867187499999,-1.845383988573187]]]}
```