Easy loading of swc into napari

[vtwang]

Description

Allows for easy loading of swc files as 3D paths. Can be used to overlay swc on images.

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

References

Resolves issue #1

Final checklist:

• [x] My PR is the minimum possible work for the desired functionality
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works

[vtwang]

Tutorial notebook https://github.com/NeuroDataDesign/napari/blob/swc/examples/add_swc_tutorial.ipynb

Proof notebook https://github.com/NeuroDataDesign/mouselit/blob/master/victor/code/napari_swc_proof.ipynb

[j1c]

• Nice work!
• My main feedback is you should format the docstrings so that they are below 88 chars. Seems like napari has pretty strict line length. Otherwise, everything looks good to go.

[vtwang]

Thank you for the feedback. I shortened the docstrings.