fix bug 1055870 - always overwrite provider session variable during social sign-in
fix bug 1059055 - Move PromoteJS out of MDN codebase
Fix bug 866533, 1054559: Update registration page

Update the registration page copy (bug 866533). In updating the copy, we
ensure that the copy is visible even when a user signs in with GitHub
(bug 1054559).
bug 866533 - tests for sign-in and sign-up pages
bug 866533 - remove unused attribute values from signup form
Merge pull request #2705 from darkwing/remove-promote-js

fix bug 1059055 - Move PromoteJS out of MDN codebase
Merge pull request #2698 from groovecoder/registration-copy-866533

Fix bug 866533, 1054559: Update registration page
fix bug 1059549 - remove duplicate account connect message
Merge pull request #2710 from groovecoder/duplicate-signup-prompt-1059549

fix bug 1059549 - remove duplicate account connect message
Merge pull request #2709 from groovecoder/signed-in-icon-1055870

fix bug 1055870: "Signed in with..." icon is wrong.
fix bug 1051016 - Move close button when login widget is hovered over
Merge pull request #2697 from darkwing/1051016-close-button-again

fix bug 1051016 - Move close button when login widget is hovered over
Fix bug 1057286: Split file attachments from wiki into a separate application.