Feature/sparklines

I'm an idiot.

alert(jQuery('body').html()) looks good, but none of our DOM changes
are reflected in the widget.

The filename argument to the pyrasite cli is mandatory.

- Move the low level socket code into the PyrasiteIPC for re-use throughout
  our GUI and payloads
- Create an 'unreliable' data transfer mode that lets payloads, like
  the reverse shells, work properly with netcat on the other end.
  By default, the IPC will prepend a length header to the data, to
  ensure reliability.
- Pull our ReverseConnection and ReversePythonConnection out into a new
  pyrasite.reverse module

Mentioned require Cython in README.  Relates to #3.