v0.5.0 (Washington)

Release Washington.

Changes:

• Renamed pythonic WPS client (#63):
  birdy.client.base.WPSClient and from birdy import WPSClient.
• Added WPSResult for WPS outputs as namedtuple (#84, #64).
• Support for Jupter Notebooks (#40):
  • cancel button (work in progress).
  • progress bar.
  • input widget.
• Updated notebooks with examples for WPSClient.