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3D tracking tutorial: problem loading zipfile stack #37

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@nkeim

Description

When I launch the 3D tracking example in Binder, running the 2nd cell (the one that loads the image stack) raises

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-5046be688d14> in <module>()
----> 1 frames = pims.ImageSequenceND(r'../sample_data/pmma_colloids.zip', axes_identifiers = ['z', 't'])
      2 frames.bundle_axes = ['z', 'y', 'x']
      3 frames.iter_axes = 't'
      4 frames

/home/main/anaconda/envs/binder/lib/python3.4/site-packages/pims/image_sequence.py in __init__(self, path_spec, process_func, dtype, as_grey, plugin, axes_identifiers)
    297         self.axes_identifiers = axes_identifiers
    298         super(ImageSequenceND, self).__init__(path_spec, process_func,
--> 299                                               dtype, as_grey, plugin)
    300         shape = self._first_frame_shape
    301         if len(shape) == 2:

/home/main/anaconda/envs/binder/lib/python3.4/site-packages/pims/image_sequence.py in __init__(self, path_spec, process_func, dtype, as_grey, plugin)
     93         self._get_files(path_spec)
     94 
---> 95         tmp = self.imread(self._filepaths[0], **self.kwargs)
     96         self._first_frame_shape = tmp.shape
     97 

/home/main/anaconda/envs/binder/lib/python3.4/site-packages/pims/image_sequence.py in imread(self, filename, **kwargs)
    118                               "scipy, matplotlib or scikit-image.")
    119         if self._is_zipfile:
--> 120             file_handle = StringIO(self._zipfile.read(filename))
    121             return imread(file_handle, **kwargs)
    122         else:

TypeError: initial_value must be str or None, not bytes

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