Enable uploading a user picture without the need for Gravatar. (BB-6060)

I don't use ID-connectors or at least I try to circumvent them as often as possible. While connecting content as much as possible is a good thing, connecting authoring is more bad than good. At least in my point of view.

So for those people who feel the need to be always recognized (and honored), give them gravatar. But please for the rest of us give us the possibility to directly upload a user picture.