Contributors improvements

This improves the handling of contributors.  It refactors the code some, allowing the contributor list to be shown on the module pages as well as the release page.  It also includes authors listed in the metadata to the contributor list, and removes the releaser.  This fixes #1270.  Finally, it improves the formatting of the list so the 'and x contributors' label doesn't move when showing the list, and limits the width of the list so it lines up nicely with the rest of the sidebar.