openweathermap bee: set current weather context

[rubiojr]

This makes it easier to retrieve the current weather from other actions as long as you have the weather bee running and a chain that periodically gets the current weather (with the cron bee for example).

Example templates:

"Weather in {{.context.weather.current.Name}}: {{(index .context.weather.current.Weather 0).Description}}, {{.context.weather.current.Main.Temp}} ºC"

Would print something like:

Weather in Barcelona: few clouds, 22.57 ºC