Deploying features and fixes to staging

* Fix: [Removed `data-no-turbolink` from YouTube sync button](https://www.pivotaltracker.com/story/show/67604358)
* Chore: [Update users edit page UI](https://www.pivotaltracker.com/story/show/67382238)
* Chore: [Add "Change your avatar at Gravatar.com." to user profile](https://www.pivotaltracker.com/story/show/65691738)
* Chore: [Refactor tests](https://www.pivotaltracker.com/story/show/67243926)
* Story: [Github link](https://www.pivotaltracker.com/story/show/66322520)
* Chores: [Redirects](https://www.pivotaltracker.com/story/show/67381296) & [Redirects](https://www.pivotaltracker.com/story/show/67380946)
* Chore: ["All Articles" link ](https://www.pivotaltracker.com/story/show/67480006)