Merge pull request #221 from nvahalik/patch-1

Change form uploads to use multipart/mixed on Android

Author: zfir

src/android/UploadTask.java

@@ -357,6 +357,7 @@ private Request createRequest() throws FileNotFoundException {
         }
 
         bodyBuilder.addFormDataPart(fileKey, filepath, fileRequestBody);
+        bodyBuilder.setType(MultipartBody.FORM);
 
         // Start build request
         String method = getInputData().getString(KEY_INPUT_HTTP_METHOD);