Merge pull request #36 from astrofrog/aplpy-affiliated

Added APLpy to affiliated packages
fixed some problems with APLpy entry
gave ginga a pypi entry
Merge pull request #38 from eteq/fix-ginga-pypi

gave ginga a pypi entry
update to stable version 0.2.2
Move the link with all the versions to the front page

Suggested by @taldcroft in astropy/astropy#1079
Merge pull request #39 from eteq/tweak-all-versions-on-index

Move the link with all the versions to the front page
removed GSoC mention
fix astropy searchbar to point to stable release
update for 0.2.3
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