PROV examples collection

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prov-wg,

In support of ISSUE-271, I have updated [1] in response to feedback from
Luc, Paul, Mike, and Eric.

Thanks for the feedback, I think that it suits more needs now and follows 
a nice pattern. Please have a read and provide any further feedback
before we press forward with populating the collection.

Please take note that [1] mentions [2] and [3].

Regards,
Tim


[1] http://www.w3.org/2011/prov/wiki/PROV_examples[2] http://www.w3.org/2011/prov/wiki/Category:PROV_example[3] http://www.w3.org/2011/prov/wiki/How_to_document_a_PROV_example