Added Stack Overflow client/secret fields.
Added stackexchange oauth.
Added public Key.
Fixed soverflow_authorized.
Remove stackoverflow email.
Tweak stackoverflow color.
Rename soverflow > stackoverflow.
Update signin button to new convention.
Fixed rebase error.
SO moved to the end of buttons list.
Sorted oauth fields of admin form by alphabet.
Merge pull request #16 from gmist/stackoverflow

Stack Overflow oauth