No help available for ubuntu-html5-app-launcher

I just learnt two things about the ubuntu-html5-app-launcher binary:
- The www parameter is deprecated
- The default is to find the html files in the current directory

We're still recommending the www parameter on one of the HTML5 tutorials [1], which would need to be updated. However, the issue is that one just finds this out asking on IRC, neither 'man ubuntu-html5-app-launcher' nor 'ubuntu-html5-app-launcher --help' work.

It'd be nice if the binary had a --help command explaining what it does, its defaults, and available parameters. In addition, it'd be also good to show a deprecation notice if someone uses the www parameter.

Thanks!

[1] https://developer.ubuntu.com/en/apps/html-5/tutorials/meanings-app-html5-tutorial/