Refactored notification and webhooks. Also created service for getting pull request number from labels
Merge branch 'master' of https://github.com/reviewninja/review.ninja
fixed notification, webhooks and added services
fixed merge conflicts
cleaned up code

[skip ci]
cleaning up code
Merge branch 'master' of https://github.com/reviewninja/review.ninja into feature/refactor-notification-webhooks
fixed tests
Merge pull request #261 from reviewninja/feature/refactor-notification-webhooks

Feature/refactor notification webhooks