Wire up campaigns in user profile #121
Description
Campaigns are actually not wired up at all in the user profile template -- the "Campaigns" tab is empty and doesn't load any dynamic data, and likewise the "Campaigns Completed" counter on the sidebar is hardcoded to display zero.
Campaigns need to be pulled in to this view and template.
Once that's done, we also need to add "blank slate" text for the "campaigns" tab to display when there are really no campaigns associated with the user yet. (See #114)