[WIP] Hangouts management feature

PT stories: 
https://www.pivotaltracker.com/story/show/71264890
https://www.pivotaltracker.com/story/show/71654160

LoFi's and architecture: http://agileventures.org/projects/websiteone/documents/hangouts-management-flow-proposal-363651f8-b976-4ebd-bbc6-fac00c78d28e