Mostly working complete implementation of EtherNet/IP CIP Encapsulation
o Unconnected Send to Logix Read/Write Tag [Fragmented] mostly working
o Added ablity to dotdict()[] to resolve indexes embedded within keys,
  to allow simpler specification of tests on complex dotdict structures.
o Added initial parsing for Unconnected Send, etc. to support CIP
  encapsulation of Logix request, local to the target CIP host.
o Mock-up of Register, Unregister, List Services.
o