This commit removes the following Tensorflow 1.0 related modules:
- spring-tensorflow-common
- spring-image-recognition-function
- spring-object-detection-function
- spring-semantic-segmentation-function
These may be resurrected at a later date but re-implemented with
either DeepJavaLibrary or TensorFlow 2.0.
* Remove Tensorflow modules from README.adoc
* Remove protobuf - was only used by Tensorflow
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