adding provisional v0.12 release notes
Merge branch 'develop' into v0.12-release
Merge branch 'develop' into v0.12-release
updating v0.12 release notes
Merge branch 'develop' into v0.12-release
Minor edits as part of review
Merge pull request #939 from BladeRunnerJS/v0.12-release

V0.12 release