introduced feature settings for hangoutsApp
unified the use of hangout button on events and projects
refactored Rspec syntax in projects spec
added uid and category to hangout model

migrate
aded generate_hangout_id
updated show views to use hangout_id and category
udated feature and steps
updated controllers and specs
updated model specs
updated view specs
refactored hangouts.js and updated specs
updated Slack service contolller and spec
more specs for model and controller

more specs for model and controller
minor refactoring in show views and specs