Add --observer to weave script help
Add --observer to weave script help

weaveworks/weave,paulbellamy/weave,weaveworks/weave,paulbellamy/weave,n054/weave,n054/weave,n054/weave,n054/weave,paulbellamy/weave,weaveworks/weave,n054/weave,paulbellamy/weave,weaveworks/weave