Prototype 4 is a success

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Block #327554
Merkle Root:
ede55f55691482ab0e194eab1f82546b2042f84d26ec5560a0176d4c78a66b1a

Ok after a few attempts I got it working and the results are in
Prototype_04. This time I use PGP Signature inline with the text. If
you open up 02_Purchase_Order_SIGNED.xml and 04_Sales_Order_SIGNED.xml
and paste their contents in to https://keybase.io/verify it will tell
you who owns the keys to each document.
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