Some release note edits for plugin portal.
Edit of release notes for incremental java compilation.
Edit of release notes for child process descriptions.
Edit of release notes for maven POM exclusions.
Edit of release notes for Ivy extra info.
No promoted features or deprecations in 2.1.
Remove java-gradle-plugin from release notes for 2.1.

Not going to announce this just yet.
Edit to release notes of Groovy version update breaking change notice.