Fix to multiple errors to get the project up and running

Commit https://github.com/stechico/gulpjs-example/commit/9158c6e24295ab86ab0b453d911a2dc83c25c4e2 fixes this:

    npm ERR! Error: No compatible version found: gulp@'>=3.4.1- <3.5.0-'
    npm ERR! Valid install targets:
    npm ERR! ["0.0.1","0.0.2","0.0.3","0.0.4","0.0.5","0.0.7","0.0.8","0.0.9","0.1.0","0.2.0","1.0.0","1.1.0","1.2.0","1.2.1","2.0.0","2.0.1","2.1.0","2.2.0","2.3.0","2.4.0","2.4.1","2.6.0","2.6.1","2.7.0","3.0.0","3.1.1","3.1.2","3.1.3","3.1.4","3.2.0","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.3.0","3.3.1","3.3.2","3.3.4","3.4.0","3.5.0","3.5.1","3.5.2"]

Commit https://github.com/stechico/gulpjs-example/commit/768951123bdf1d818e4085f62f07ccbc1e4e23de fixes this:

    [gulp] Running 'default'...
    gulp.run() has been deprecated. Use task dependencies or gulp.watch task triggering instead.