Yt-idv

* minimum yt version is now 4.1
* Added isocontour shader by sochowski in [40](https://github.com/yt-project/yt_idv/pull/40)
* Block-rendering based slicing by matthewturk in [13](https://github.com/yt-project/yt_idv/pull/13)
* Curve plotting by chrishavlin in [26](https://github.com/yt-project/yt_idv/pull/26)
* Pop-up help by chrishavlin in [44](https://github.com/yt-project/yt_idv/pull/44)
* allow uniform arrays by matthewturk in [38](https://github.com/yt-project/yt_idv/pull/38)
* Make windows resizable by matthewturk in [57](https://github.com/yt-project/yt_idv/pull/57)

**Full Changelog**: [v0.2.3-v0.3.0](https://github.com/yt-project/yt_idv/compare/v0.2.3...v0.3.0)

* Fixes to manifest, restoring pypi functionality.

* bug fixes and improvements: full change history to come in upcoming minor release.

* Add grid positions annotation
* Add OSMesa rendering context for off-screen rendering
* Add geometry shader support
* Add tests and a handful of new examples
* Fix rendering meshes
* Regularize uniform names across shaders

* First release on PyPI.