Improve debugging

[twolfson]

Should be able to do Sauron.debug('main') and it will debug the 'main' channel
Similarly, we can use regexp .debug(/main/) which will debug for any channel that has 'main' inside of it

Also, allow for a function as the second parameter which allows for manipulation of the Sauron object
Sauron.debug('main', function (Sauron) {
console.log(Sauron);
});