Merge changes from 1.4-rc0 back into master (#13670)

* Update RELEASE NOTES for TensorFlow 1.4

* Update the version strings for TF 1.4-rc0.

* Update version strings in POM files missed by update script.

* Pin TensorBoard 0.4 to TensorFlow 1.4

* Fixing the name of the disabled test. (#13592)

* Revert "Implementing ghost batch norm as defined in https://arxiv.org/pdf/1705.08741."

This reverts commit 125f7afa.

* Disable iterator_ops_test on Windows for 1.4 release (#13609)

* Disable failing Windows tests for r1.4 release.

testRemoteIteratorUsingRemoteCallOpDirectSessionGPUCPU test is failing
with "TypeError: only integer scalar arrays can be converted to a scalar
index" on the Windows GPU Release bot. Disabling test.

* Fix typo.

* Also disalbe iterator_ops_test from contrib/.

* Add contributing authors to 1.4 Release notes.

Thanks!

* Fixes to authors.

Removed duplicate and removed googler from contributing author list.

* Fixes and additions to release notes.

Added line about Keras moving into core.
Added line about CUDA/cuDNN versions.
Added line about custom ops.

* Back out cherry-picking batch norm revert into master.