New endpoints to create/update a channel
Add filter to return contributions by project id
Add manager attr to user serializer
Update dummy app
Merge pull request #75 from neighborly/jl-new-update-channel

New endpoints to create/update a channel
Merge pull request #77 from neighborly/jl-add-project-filter-to-contributions

Add filter to return contributions by project id
Merge pull request #78 from neighborly/jl-add-manager-to-users

Add manager attr to user serializer
Create channel members endpoints