[uf-new] grouping-examples updated

[Manu Sporny]

There are now 68 examples listed on the grouping examples page. Here are
the results of the analysis:

* 100% of examples contained some form of grouping
* 75%: unordered
* 71%: non-sparse
* 66%: sparse
* 59%: ordered

All of the examples and analysis can be found here:

http://microformats.org/wiki/grouping-examples

What was surprising at first was that ordered collections have dropped
since adding more representative examples. It makes sense once you think
about it - humans tend to sort items into collections before ordering
those collections.

It was also discovered that as the amount of content on a page grows,
the probability that all four grouping methods are utilized increases.

-- manu