user should now provide his personal API key

Conflicts resolved on rebase with master:
	addon.xml
	resources/lib/wunderground.py
[fix] regression double degree on 36 hour

This was reintroduced after a2c10e704ffb5ab21e8146dc38541bbedd81506f
[fix] WAIK = user input not -1 char else is invalid

Dont strip any characters from user api key else is invalid.