Merge branch 'release/1.1.0'
Merge branch 'release/1.2.0'
Merge branch 'release/1.3.0'
Merge branch 'release/1.4.0'
Merge branch 'release/1.5.0'
Merge branch 'release/1.6.0'
Merge branch 'release/1.7.0'
Merge branch 'release/1.8.0'
Simplify bootstrap sample.
Set release versin 1.9.0
Merge branch 'release/1.9.0'
Merge tag '1.9.0' into develop

Release 1.9.0
Set next snapshot version