* add initial precipitation support
* move attr to component
* remove blank line
* add forecast attributes to platform and update demo
* add tests
* break long lines
* calc lower temp correctly
* move all new attributes to component
* convert temp low only when existing
* Added forecast functionality to the weather platform, updated OWM to get forecast data
* style fixes
* Changed returned forecast data to a more managable dict
* Fixed line length
* forecast will always be collected, data returned from owm is based on metric setting
* use list comprehension to create the forecast data
* Added forecast data to the weather demo
* Create dict directly in list comprehension
* Minor variable change in weather demo platform
* Convert forecast temperatures in weather component
* set forecast attributes as constants
* Style fixes and tests
* Copied forecast_entry instead of mutating data
