[PATCH] More collections docs

[Rodney Waldhoff]

FYI, I checked in Chuck's patch to commons/xdocs and commons/collections, 
regenerated the commons/docs directory, and pushed it to the live site.

Charles Burdick wrote:

>Helpful overview table providing a breakdown of collections elements by 
>type.  Minor enhancements to buildfile as well.

Thanks Chuck.

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