Register WeatherUtility as a global utility as we have no data to persist on it

Fixes #7
Register WeatherUtility as a global utility as we have no data to persist on it

Fixes #7
Merge branch 'master' into issue_14
Merge branch 'master' into issue_14
Merge branch 'master' into issue_14

Conflicts:
	src/collective/weather/profiles/default/viewlets.xml
Add a new option to define whether or not the weather viewlet is visible (closes #14)

By default the viewlet is hidden
Merge pull request #22 from collective/issue_14

Add option to define viewlet visibility