1.1.0 2016/09/12 ABI 4 (5:0:0)

• New functionality: provide a plug-in for writing new Metrics,
  Astrobjs and Spectra in Python.
• New functionality: objects can describe there own
  properties. This feature is accessible through the help() method
  in the Python and Yorick interfaces and through -h on the
  command-line: "gyoto -hMetric::KerrBL"
• New functionality: adding a flag to highligh the shadow region in
  a strong-field image
• Various improvements and bug fixes in the Python extension.
• Yorick: Add more functions to control the floating-point
  environment from Yorick.
• Screen: properly parse "Mask" as a filename
• KerrKS: remove specific integrator, which has never worked well.
• PowerLawSpectrum: add cut-offs.
• DirectionalDisk: add cutoff in lamp/disk frames.
• PolishDoughnut: add central_temperature_ parameter.