Navis

_Date: 29/06/20_

Breaking
- `navis.nx2neuron` now returns a `navis.TreeNeuron` instead of a `DataFrame`

Additions
- New neuron class `navis.MeshNeuron`
- New `navis.TreeNeuron` property `.volume`
- New example data from the Janelia hemibrain data set

Improvements
- Clean-up in neuromorpho interface
- We now use [ncollpyde](https://pypi.org/project/ncollpyde) for ray casting (intersections)

Fixes
- Fix bugs in `navis.Volume` pickling

_Date: 26/05/20_

Fixes
- Many small bugfixes

_Date: 15/05/20_

Improvements
- Improvements to R and Blender interface
- Improved loading from SWCs (up to 2x faster)
- `TreeNeurons`: allow rerooting by setting the `.root` attribute

_Date: 05/05/20_

Fixes
- Emergency fixes for critical bugs

_Date: 05/05/20_

Additions
- new function: `navis.vary_color`

Improvements
- improvements to Blender interface and various other functions

_Date: 02/04/20_

Imnprovements
- `navis.Volume` is now sublcass of `trimesh.Trimesh`