Updated binary lists.  Full index now has Nginx 1.6.0 & 1.7.0.  Latest list now shows the latest version for each major release (i.e. first two places from the left).
Modified script to generate list with latest version for each major version (left most two places in version number) of a package.  Also, refactored code to generate the list of files for a version into it's own method.
Updated docs for recent changes.