Add workaround for orca segmentation fault#1140
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Unset the NODE_OPTIONS environment variable before calling orca to avoid an orca segmentation fault
Example test failure:
```
======================================================================
ERROR: test_stream_single_points (plotly.tests.test_plot_ly.test_stream.test_stream.TestStreaming)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/circleci/project/plotly/tests/test_plot_ly/test_stream/test_stream.py", line 52, in test_stream_single_points
my_stream.write(Scatter(x=[1], y=[10]))
File "/home/circleci/project/plotly/plotly/plotly.py", line 704, in write
self._stream.write(jdata, reconnect_on=reconnect_on)
File "/home/circleci/project/plotly/plotly/chunked_requests/chunked_request.py", line 61, in write
msg=response.read()))
Exception: Server responded with status code: 502
and message: <html><body><h1>502 Bad Gateway</h1>
The server returned an invalid or incomplete response.
</body></html>
```
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See discussion in plotly/orca#124
This PR adds a line to unset the
NODE_OPTIONSenvironment variable before calling orca, thereby avoiding the segmentation fault.