Documentation errors

[elrik75]

Chapter 4.1: s.in_memory() should be s.open_in_memory() A bit bellow, you write n.dump() but 'n' is not defined yet, it should be s.root.dump()

Chapter 5.1: An init is missing, we don't understand that the context has changed. I propose the sentence: ”Launch ConfigurationTrre using python3.5 -i tree.py ” Then add n =Configuration('/tmp/tree') and then the line n.server.listen = '127.0.0.1' will work fine. In adition we can add a show of the initial state

>>> n
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