topic loading works now
refactored Topic before splitting out the Builder pieces
moved the topic buildout to TopicBuilder
project loader works again
spiked TopicGraph, ProjectRoot find by key
DocumentProjectLoader and the registry extensions appear to work
checkpoint: ripped out the old FubuDocs code
checkpoint: moved the 'how to' docs to the new FubuWorld.Docs folder
checkpoint: implemented the BuildChain() functionality for topics
checkpoint:  can build out the behavior for a topic chain
recoded TopicBehavior to go closer to the metal w/ the view
added chrome back to the topic pages, got the navigation working again
topic table of contents working again
consolidated the extensions and configuration a little bit
pruned the commands to eliminate the old cruft