[editor] Export query result to S3

[20/Jul/2016 18:43:51 -0700] decorators   ERROR    Error running <function export_result at 0x7f2c9842a410>
Traceback (most recent call last):
  File "/home/romain/projects/hue/desktop/libs/notebook/src/notebook/decorators.py", line 81, in decorator
    return func(*args, **kwargs)
  File "/home/romain/projects/hue/desktop/libs/notebook/src/notebook/api.py", line 655, in export_result
    response['watch_url'] = api.export_data_as_hdfs_file(snippet, destination, overwrite)
  File "/home/romain/projects/hue/desktop/libs/notebook/src/notebook/connectors/hiveserver2.py", line 67, in decorator
    return func(*args, **kwargs)
  File "/home/romain/projects/hue/desktop/libs/notebook/src/notebook/connectors/hiveserver2.py", line 412, in export_data_as_hdfs_file
    upload(target_file, handle, self.request.user, db, self.request.fs)
  File "/home/romain/projects/hue/apps/beeswax/src/beeswax/data_export.py", line 72, in upload
    fs.do_as_user(user.username, fs.append, path, dataset.csv)
  File "/home/romain/projects/hue/desktop/core/src/desktop/lib/fs/proxyfs.py", line 86, in do_as_user
    return fn(*args, **kwargs)
  File "/home/romain/projects/hue/desktop/core/src/desktop/lib/fs/proxyfs.py", line 135, in append
    return self._get_fs(path).append(path, *args, **kwargs)
AttributeError: 'S3FileSystem' object has no attribute 'append'