fs.py: minor update to debugging capability.  command line can take multiple -d args to increase debugging output.  fs.debug property is stored as int instead of boolean now.
fslib.traffic: modify logger initialization to be specific python module name
fslib.configurator: modify logger initialization to be specific python module name
Fix kwarg parsing for boolean parameters
Fix boolean coercion from string config kw arg in node classes; start of additional capability to explicitly trace openflow control messages.
node configuration: default kwarg needs to be a string for boolean eval
harpoon: add some debug logging to expose file transfer initiation
Add basic tracing to openflow switches; still needs lots of improvement.
Modify POX initialization sequence somewhat.
readme: add simple example/instructions for fs-sdn (pox/openflow extensions)