Release 1.11.0-rc0

Major Features and Improvements

• Prometheus exporter for TF metrics (see 021efbd for details).
• Added new REST API to get status of model(s) from ModelServer.

Breaking Changes

• No breaking changes

Bug Fixes and Other Changes

• Built against TensorFlow 1.11.0-rc0.
• Directly import tensor.proto.h (the transitive import will be removed from tensor.h soon)
• Building optimized TensorFlow Serving binaries is now easier (see docs for details)
• Adds columnar format support for input/output tensors in Predict REST API (fixes #1047)
• Development Dockerfiles now produce a more optimized ModelServer
• Fixed TensorFlow Serving API PyPi package overwriting TensorFlow package.