Don't clobber bop()'s first parameter.

[vin]

Now a call like

bot.bop(callback);

is the same as

bot.vote('up', callback);

Before this change, the caller had to pass in a dummy first argument like

bot.bop(null, callback);

[alaingilbert]

> var arguments = [1, 2, 3];
undefined
> arguments
[ 1, 2, 3 ]
> var args = Array.prototype.slice(arguments);
undefined
> args
[]
> args.unshift('up')
1
> args
[ 'up' ]

> var a = function () {
      var args = Array.prototype.slice(arguments);
      args.unshift('up');
      console.log(args);
    };
undefined
> a(1, 2);
[ 'up' ]

It doesn't seems to work.

[alaingilbert]

I changed this line:

var args = Array.prototype.slice(arguments);

by:

var args = Array.prototype.slice.call(arguments);

[vin]

Woops, thanks. Next time I'll test it first :-X