removing getsatisfaction from support

This is a proposal for fixing https://bugzilla.mozilla.org/show_bug.cgi?id=720039.
What this does: remove the link, popup and JS on an addon details page (when GetSatisfaction available) and infos about publishing an addon with GetSatisfaction support.
What this does NOT: remove the possibility for an addon to use GetSatisfaction (model, form with their tests and fixtures are preserved)