Make iD default editor

Make iD the default editor for all users that have not specified
a preferred editor, except fall back to P2 on IE.
Compact user menu
Convert edit menus to bootstrap dropdown
Specify width and height for image

User-uploaded images don't get automatically scaled
like Gravatar images do.
Use user_thumbnail_tiny
Pare menu down to basics
Drop role and aria attributes
Consistent title case
Merge remote-tracking branch 'osmlab/user-display'
Merge remote-tracking branch 'osmlab/id-default'