Some minor cleanups, and fixed the 'memory testing' code
Significantly improved each_node() - it no longer loops through metabytes of nothing
Exposed the 'segments' to the web, and changed 'force_text' to a parameter
Got rid of the extra 'address' field on the node list, and also turned off 'pretty' formatting by default
Updated the memory_abstraction test with slightly more realistic data
Changed the automatically generated 'undefined' nodes to match the specs better (that is, they now have a :value field)