Merge branch 'rc/1.9.9' into release 

Merge branch 'rc/1.9.8' into release 

Merge branch 'rc/1.9.7' into release 

Merge branch 'rc/1.9.6' into release 

Merge branch 'rc/1.9.5' into release 

Merge branch 'rc/1.9.4' into release 

Merge branch 'rc/1.9.3' into release 

Merge branch 'rc/1.9.2' into release 

Merge branch 'rc/1.9.1' into release 

Update release notes for 1.9.0