Added user-friendly page about affiliated packages
Add link to registry
Added APLpy and Ginga to featured packages
Fix link to affiliated packages in menu bar
Merge the affiliated package user-friendly page and the repository, removed extraneous content.
Fixed Python-montage -> Montage-wrapper
Added link for Montage-wrapper home
Improve layout
Merge pull request #41 from astrofrog/affiliated-improvements

User-friendly page for affiliated packages