New weather module: forecast and forecast/daily support

Hi everybody, I implemented the support for forecast and forecast/daily using openweathermap in PR #1514. As I did not have a apiKey to test the forecast/daily part, I downloaded a sample file from their website and included it in my testing. I am not sure if all cases are handled well, please do check, if you find any other issues.

Thank you very much @fewieden and @vincep5 for you hints and support!

Also before merging my code, we should discuss, if my code is looking as it should:

This part appears twice in the hourly forecast part and a third time (similarly) in the daily forecast part.

minTemp.push(forecast.main.temp_min);
maxTemp.push(forecast.main.temp_max);

if (forecast.hasOwnProperty("rain")) {
	if (this.config.units === "imperial" && !isNaN(forecast.rain["3h"])) {
		rain += forecast.rain["3h"] / 25.4;
	} else if (!isNaN(forecast.rain["3h"])){
		rain += forecast.rain["3h"];
	} else {
		rain += 0;
	}
} else {
	rain += 0;
}

Have a nice weekend!

[fwitte]

Rain values of 0 should not be displayed anymore, also I simplified the code. One appearance of the code mentioned above was not required!

[rts58]

Okay, I played around with the config settings. I looked at the API and it recommended only passing the location ID to insure an accurate result. Although not shown above apparently I also had location: . I removed it as above and it is now returning a result. Sorry for the distraction. Although, you may want to consider removing location: from config settings. @vincep5 Thanks for your help.