[personal-api] user should now provide his personal API key

fixes by uNiversaI:

Conflicts resolved on rebase https://github.com/XBMC-Addons/weather.wunderground/commit/a2c10e704ffb5ab21e8146dc38541bbedd81506f with master:
	addon.xml
	resources/lib/wunderground.py

* bump addon version and update changelog