Pedantic renaming.
YencDecoder optimizations and improved tests for it.
Overview response parsing. Concurrency improvements.

* Multiline responses fulfill futures as soon as initial response line is
  received. This allows streaming support for the responses. e.g overview
  response is in the form of an Iterator that peels stuff off as it comes out
  over the wire (after being decoded, inflated, etc).
Improved date parsing in OverviewResponse.