Merge branch 'release/0.1.5'
Merge branch 'release/0.2.0'
Merge branch 'master' of github.com:twitter/summingbird
Merge branch 'release/0.2.1'
Release 0.2.2 items
Merge branch 'release/0.2.2' into develop
Merge branch 'release/0.2.2'
Merge branch 'develop' of github.com:twitter/summingbird into develop
Merge branch 'release/0.2.2' into develop