Koding Integration

What does this MR do?

Will provide Koding integration with GitLab services. Forked from !4914 (merged).

Are there points in the code the reviewer needs to double check?

I've introduced new layouts which might not be necessary, first time contributor.

Why was this MR needed?

We're planning to ship Koding with GitLab.

What are the relevant issue numbers?

#12759 (closed) #14698 (moved)

Screenshots (if relevant)

Screencasts

http://recordit.co/BDMbhwgxPD http://recordit.co/By0qiz1ClC

Enable Koding in Application Settings

Koding Dashboard

Set up Koding Stack

1 - 2 -

Run on Koding on Project Page

Run in IDE on Merge Requests

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together