Sleap

Minor improvements:
- use "auto" as default crop size in baseline topdown configs
- expose early stopping params in GUI

Bug fixes:
- pin attrs to 19.3 (fixes 346)
- pass original image through topdown inference pipeline to flow tracker (fixes 343)

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Validation set:
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Frames: 1 / Instances: 2
Metrics:
Dist (90%/95%/99%): 1.377530428143121 / 1.4410399538615883 / 1.4918475744363626
OKS VOC (mAP / mAR): 0.8252475247524752 / 0.85

The initial public release!

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Test set:
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- Non-visible points now have text rendered in gray with an asterisk as a clearer visual indicator (560)

- Fix color cycle order changing when creating instances from predictions (518)
- Add Tracks menu -> Delete All Tracks command

Installing
We recommend using [Miniconda](https://docs.conda.io/en/latest/miniconda.html) to install and manage your Python environments. This will also make GPU support work transparently without installing additional dependencies.

See the [Installation page](https://sleap.ai/installation.html) in the docs for more info.

Using Conda (Windows/Linux)
1. Delete any existing environment and start fresh (*recommended*):

conda env remove -n sleap


2. Create new environment `sleap` (*recommended*):

Automated release of 0.2.2a6 on 2020-05-11