added feature and steps for live_sessions
added associations with Project and User(host)
added migration: project, host, youtube_video_id, participants to Hangout
added route for hangouts/index
added index page for hangouts
updated :local_request? forhangouts_controller
modified index view for hangouts
added feature for live hangouts display
expanded index view and specs
changed default scope for hangouts to DESC
updated hangout_button rendering to pass project_id and host
added partial and spec to render user avatar with popover
updated feature and view spec to render host and participants avatars
extracted html into partials
adjusted project and events show view and specs to pass in project_id
modified hangout model and specs to store participants
introduced HangoutPresenter and NullUser

nullUser
modified scenarios to test participants
modified index specs after extraction of partials
merge resolution

merge conflict
added show all/live button
added hangouts.js to precompile list
expanded the first collapsed session
UI changes after code review