Certain pictures in the pictures directory look like they're just part of the site (buttons, diagrams that are shown on pages, etc.) while other pictures (which is to say files in the sites/default/files/pictures directory) are user uploaded profile images and institutional logos.  Adding in the pictures that need to be part of every install for the site to work.  Updating the gitignore on the sites/*/files dir to be more permissive - there's a lot of stuff in there that we need.