Merge branch 'p-1' into 'master'

improve the imshow function to return the output of plt.imshow

See merge request !25
19 jobs for master in 9 minutes and 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Build
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conda-macosx
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  Test
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conda-macosx
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conda-macosx
test_macosx_34

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  Wheels
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