Update version.py for 0.12.0

Merge pull request tensorflow#718 from tensorflow/bump_version.py

Bump the version to 0.11.0

Merge pull request tensorflow#696 from tensorflow/WGierke-patch-1

Update version.py

Update RELEASE.md

Update RELEASE.md as part of the release process.

Update version.py

Update version.py for 0.8 release

Update version.py

Update version.py

Add release notes and set version to 0.5.0

Update version.py for 0.4.0

Update version.py

Changing version.py to match the release version