LDS: query.fromNetwork() (#1002)

Taken from Android API [fromNetwork()](http://parseplatform.org/Parse-SDK-Android/api/com/parse/ParseQuery.html#fromNetwork--)

Author: dplewis

src/ParseQuery.js

@@ -1774,6 +1774,17 @@ class ParseQuery {
     return query;
   }
 
+  /**
+   * Change the source of this query to the server.
+   *
+   * @return {Parse.Query} Returns the query, so you can chain this call.
+   */
+  fromNetwork(): ParseQuery {
+    this._queriesLocalDatastore = false;
+    this._localDatastorePinName = null;
+    return this;
+  }
+
   /**
    * Changes the source of this query to all pinned objects.
    *

src/__tests__/ParseQuery-test.js

@@ -2346,6 +2346,10 @@ describe('ParseQuery LocalDatastore', () => {
     q.fromPin();
     expect(q._queriesLocalDatastore).toBe(true);
     expect(q._localDatastorePinName).toBe(DEFAULT_PIN);
+    const query = q.fromNetwork();
+    expect(q._queriesLocalDatastore).toBe(false);
+    expect(q._localDatastorePinName).toBe(null);
+    expect(query).toEqual(q);
   });
 
   it('can query from pin with name', () => {