Season Sensor

This sensor will display the current astronomical or meteorological season (Spring, Summer, Autumn, Winter) based on the users setting in the config file.

All information about how the seasons work was taken from Wikipedia:

• https://en.wikipedia.org/wiki/Season#Astronomical
• https://en.wikipedia.org/wiki/Equinox
• https://en.wikipedia.org/wiki/Solstice

# Example configuration.yaml entry
sensor:
  - platform: season
    type: astronomical (optional, will default to astronomical)