Depthy

This release comes with the following features:
- optional arguments `show_axes` and `s` in `plot_point_cloud` to switch off axes and change point size, respectively
- fix occlusion problem in `plot_point_cloud`

This release fixes two issues in the ``plot_point_cloud`` function, namely:
- passing an rgb image with values outside 0-1 range caused an error which is solved through image normalization
- passing an ``Axes3DSubplot``object returned a tuple which is unintended behaviour and now yields ``Axes3DSubplot``

This release features important matplotlib import exceptions. This may be useful in case the famous plot library is not available or left out on purpose.

The release contains minor modifications to the depth quality configuration and plot function reliability.

The initial release contains the following features:
- depth map computation using epipolar images from light-fields
- *.ply and *.pfm export for depth maps
- CLI usage, e.g. ``depthy -h``
- wheel distribution and pypi support
- documentation at https://hahnec.github.io/depthy/