Added cityscapes dataset#225

Merged

tfds-copybara merged 15 commits intotensorflow:masterfrom

f1recracker:master

Jan 3, 2020

Commits on Mar 11, 2019

Commits on Mar 14, 2019

Commits on May 14, 2019

Merge branch 'master' of https://github.com/tensorflow/datasets
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Commits on May 15, 2019

Updated cityscapes class to use BuilderConfig
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Commits on Aug 2, 2019

Merge branch 'master' of https://github.com/tensorflow/datasets
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Commits on Aug 10, 2019

Commits on Aug 12, 2019

Commits on Aug 14, 2019

Removed explicit num_shards calculations
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Commits on Nov 17, 2019

Merge branch 'master' of https://github.com/tensorflow/datasets
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Commits on Nov 18, 2019

Removed python3 specific syntax
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