Do all underscore addition

doAll.js

_.doAll = function(fn) {
    var fns = Array.prototype.slice.call(arguments);

    return function() {
        var self = this;
        var target_args = Array.prototype.slice.call(arguments);
        return _.map(fns, function(fn) {
            return fn.apply(self, target_args)
        });
    }

}