Fix DELETE operations (#616)

Author: rogerhu

Parse/src/main/java/com/parse/ParseOkHttpClient.java

@@ -117,11 +117,9 @@ public ParseOkHttpClient(int socketOperationTimeout, SSLSessionCache sslSessionC
         okHttpRequestBuilder.get();
         break;
       case DELETE:
-        okHttpRequestBuilder.delete();
-        break;
       case POST:
       case PUT:
-        // Since we need to set body and method at the same time for POST and PUT, we will do it in
+        // Since we need to set body and method at the same time for DELETE, POST, PUT, we will do it in
         // the following.
         break;
       default:
@@ -154,6 +152,8 @@ public ParseOkHttpClient(int socketOperationTimeout, SSLSessionCache sslSessionC
       case POST:
         okHttpRequestBuilder.post(okHttpRequestBody);
         break;
+      case DELETE:
+        okHttpRequestBuilder.delete(okHttpRequestBody);
     }
     return okHttpRequestBuilder.build();
   }

Parse/src/test/java/com/parse/ParseOkHttpClientTest.java

@@ -82,6 +82,7 @@ public void testGetOkHttpRequestType() throws IOException {
         .build();
     okHttpRequest = parseClient.getRequest(parseRequest);
     assertEquals(ParseHttpRequest.Method.DELETE.toString(), okHttpRequest.method());
+    assertEquals(null, okHttpRequest.body());
 
     // Put
     parseRequest = builder