gulpfile.js

var gulp = require("gulp");
var debug = require("gulp-debug");
var request = require("request");

var source = require("vinyl-source-stream");
var streamify = require("gulp-streamify");

var prepend = require("gulp-header");
var uglify = require("gulp-uglify");

var sources = {
    "d3.js":           "https://raw.githubusercontent.com/mbostock/d3/master/d3.js",
    "draggabilly.js":  "http://draggabilly.desandro.com/draggabilly.pkgd.js",
    "imagesloaded.js": "http://imagesloaded.desandro.com/imagesloaded.pkgd.js",
    "infinity.js":     "http://airbnb.github.io/infinity/infinity.js",
    "jquery-1.js":     "http://code.jquery.com/jquery-1.11.2.js",
    "jquery-2.js":     "http://code.jquery.com/jquery-2.1.3.js",
    "masonry.js":      "https://raw.githubusercontent.com/desandro/masonry/master/dist/masonry.pkgd.js",
    "moment.js":       "http://momentjs.com/downloads/moment.js",
    "packery.js":      "http://packery.metafizzy.co/packery.pkgd.js",
    "paper.js":        "https://raw.githubusercontent.com/paperjs/paper.js/master/dist/paper-full.js",
    "phaser.js":       "https://raw.githubusercontent.com/photonstorm/phaser/master/build/phaser.js",
    "pixi.js":         "https://raw.githubusercontent.com/GoodBoyDigital/pixi.js/master/bin/pixi.dev.js",
    "sloth.js":        "https://raw.githubusercontent.com/hakubo/Sloth/master/sloth.max.js",
    "stats.js":        "https://raw.githubusercontent.com/mrdoob/stats.js/master/src/Stats.js",
    "underscore.js":   "https://raw.githubusercontent.com/jashkenas/underscore/master/underscore.js",
    "waypoints.js":    "https://raw.githubusercontent.com/imakewebthings/waypoints/master/lib/jquery.waypoints.js",
};

gulp.task("default", function () {
    for (var name in sources) {
        var url = sources[name];

        request(url)
            .pipe(source(name))
            .pipe(debug({title: name + ":"}))
            .pipe(gulp.dest("dist/dev/"))
            .pipe(streamify(uglify()))
            .pipe(prepend("/* source: " + url + " */\n"))
            .pipe(gulp.dest("dist/"));
    }
});

package.json

{
  "dependencies": {
    "gulp": "^3.8.11",
    "gulp-debug": "^2.0.1",
    "gulp-header": "^1.2.2",
    "gulp-streamify": "0.0.5",
    "gulp-uglify": "^1.2.0",
    "request": "^2.55.0",
    "vinyl-source-stream": "^1.1.0"
  }
}