Front API Integration

Front has been growing in popularity and is sort of like the Slack equivalent for team inboxes see: frontapp.com

Currently, Github and Jira issue tracking both support Front so it seems like it could be a good fit for GitLab too, what do you think?

Oh, BTW they have their entire Product Roadmap as a public Trello board, pretty nifty, something GitLab could consider too...

@sytses @JobV