Modified DefaultHandler arg handling

[siddMahen]

Now, if you want to get a dom with options but
without a callback, you can do:

var opts = { .....options..... };
var handler = new htmlparser.DefaultHandler(opts);

instead of:

var handler = new htmlparser.DefaultHandler(function(){}, opts);

which might lead to uncaught errors.

[fb55]

You may also pass null as the callback, and any error will get thrown. But the idea isn't bad, I just don't like how it was done (it's also dangerous). I prefer to have alternatives as part of the prototype - this is even required if the reset function should be used (happens eg. when you use parseComplete). Otherwise, all options and callbacks would be overwritten.

I'll push a patch soon that implements this in a safe way.

[siddMahen]

Thanks for the feedback