Make the client argument optional

[lpinca]

According to the documentation the constructor takes two optional arguments, but calling the constructor like this:

var client = new SteamUser({ dataDirectory: __dirname + '/data' });

returns an error.
This patch should fix the issue.

[DoctorMcKay]

This won't work if the app imports Steam from somewhere different from where SteamUser gets it.

For example:

 | app.js
 | node_modules
   |----steam
   |----steam-user
        |----node_modules
             |----steam

app.js does require('steam') and instantiates a SteamClient from there. That SteamClient won't be an instanceof SteamUser's SteamClient.

[lpinca]

Good point, what about checking if it's an EventEmitter?

[DoctorMcKay]

That sounds reasonable.

[lpinca]

Or checking if the constructor name is SteamClient.

foo.constructor.name === 'SteamClient';

[DoctorMcKay]

That sounds even better.

[lpinca]

Updated.

[DoctorMcKay]

Thanks.