Note: new to python, please provide any feedback

Currently webbrowser.open supports one url, and there is no fn for url batching. I am proposing modifying webbrowser.open to support something along these lines:

```
def open(*urls, new=0, autoraise=True):
        ...
        browser = get(name)
        actions = [browser.open(url, new, autoraise) for url in urls]
        ...

# usage
open('http://example.com', 'http://example2.com')
```