weather: forecast up to 10 days

This service needs api key. For now I put it straightly into the url
It will need to be replaced, like in perl with {{ENV_APIKEY}} , but not sure if python supports this. Gonna look at it deeply.

Signed-off-by: Adrian Matejov <a.matejov@centrum.sk>
Wouldn't it be better to take the burden of storing data from user and store it internally in object? And we could return True/False here (as in success/failure), or in case of failure, throw an exception?