Merge branch 'hotfix/0.5.6'
Merge branch 'release/0.5.7'
Merge branch 'release/0.5.8'
Merge branch 'release/0.5.9'
Merge branch 'release/0.6.0'
Merge branch 'release/0.6.1'
Merge branch 'release/0.6.2'
Merge branch 'release/0.6.3'
fix rvm string
Merge branch 'hotfix/0.6.4' into develop