Add Hipchat services API

There was no way to add a Hipchat services through the API.

This commit add two API route:
`PUT /projects/:id/services/hipchat (:token, :room)`
`DELETE /projects/:id/services/hipchat`

To add or remove a hipchat service for a project.
Prefer single-quoted strings when you don't need string interpolation or special symbols.