Added HTTParty to Gemfile
Added SlackService
Passing in Category and Event Name to Slack
Add Spec for SlackService in Hangouts Controller
Specs for SlackService
Moving over to module from class
Using Non-Persisted Models instead of mocks and doubles
Removed HTTParty in favor of Net::HTTP and using initializer for setting the constant
Merge pull request #444 from sampritipanda/slack_hangout

Slack Hangout Notifications