Dash-vtk

Added

* Support for encoded binary arrays to improve loading speed (43)

Fixed

* CSS typo in demos (43)

Changed

- `react-vtk-js` was updated from `1.2.1` to `1.5.0`. See [diffs](https://github.com/Kitware/react-vtk-js/compare/v1.2.1...v1.5.0)
- dash-vtk is now loaded asynchronously (see https://github.com/plotly/dash-vtk/pull/29). It will only be loaded when one or more components is called/displayed; this helps optimize for multi-page apps and use cases where dash-vtk is dynamically loaded.

Added

* Adding picking capabilities
* Adding CubeAxes on GeometryRepresentation

Fixed
* fix bug when using cell data with `to_mesh_state`

Fixed
* fix(react-vtk-js): fix dynamic handling of DataArray update

Changed
* update to react-vtk-js 1.1.4
* doc(View): Update props to include style/className

Added
* 3 new demos using dicom (24)
* GlyphRepresentation

Changed
* Added `vtk` to `setup.py`'s install requires.

Fixed
* VolumeDataRepresentation typo
* GIF URL in README.md

Changed
* Added section about deployment in `README.md`
* `dash_vtk.utils`: Will try to import `vtkmodules` (`>=9.0.1`) before falling back to `vtk` (`<=8.1.2`) to avoid requiring `libGL`.