Fix Windows issue with ampersand in the URLs

[jakub-g]

Fixed #9

Tested in node:

require('./opener')('http://example.org/?a=1&b=2&c=3')

and in the command line:

./opener.js "http://example.org/?a=1&b=2&c=3"

now it opens those URLs correctly. In the command line it's still needed to quote the URL, I think there's no way around it, since Windows is interpreting the ampersand before it passes it to the program, unless you quote the param.

[jakub-g]

BTW regarding multiple arguments, it does not seem to work in Windows (I didn't check on other platforms). Basically

start "" "http://example.org/1" "http://example.org/2"

this opens the first URL only.

[domenic]

Released as 1.4.1, thanks!

[jakub-g]

Thanks!